Ugh, a list thread. Guys, can you at least describe why you chose what you chose? You know, so there's something to actually discuss?
Also, I am quite skeptical that a number of your entries are actually 200+ hours. At least going by my own counts, many of these games (single-player ones specifically) would require quite a few replays to reach that value.
Dark Souls 2 -- Believe it or not, I have put more hours into this than the original at this point. A full 258 hours vs. the 122 I put into the first game. The reason for this is simple: the game's replay value is far superior. The additional enemies in NG+, and the much-improved PvP and game balance means that I actually have fun for longer periods of time than I did playing the first game. I can actually spend hours just beating up other players for funsies, which is a far cry from my experience with the original, where the constant backstab fishing just made the PvP utterly unbearable.
EVE Online -- Not gonna lie, I ain't proud of this one. Most of that time is spent running repetitive missions and chatting away in the public corp channel, rather than doing anything sandbox-y. The game's just so pretty, you know?
Phantasy Star Online 2 -- What can I say? Game's got legs. Granted, a lot of time on the clock is just me sitting around afk or in lobbies chatting, but even if only 1/4 of that time is time actually spent played, I still passed the 500-hour mark quite some time ago. This is in spite of the game being mediocre in many areas. SEGA's got a captive audience, really.
Everquest 2 -- Pretty sure most of this is entirely due to the setting. There's just nothing else quite like the Everquest setting. Iksar best race.
Final Fantasy XIV -- Best themepark MMO on the market right now. It's a testament to Yoshida and the team's passion that they were both able to turn the game around from its disastrous 1.0 launch AND continue supporting the game with regular and very sizable content patches at a strong 3-month cadence. No other dev studio on the market has such an amazing track record.
Blade & Soul - China Edition -- It's a testament to the game's strength that I pushed on through despite a crippling language barrier and an equally crippling latency disadvantage. In fact, the latency is really the only reason I stopped playing the darn thing. As soon as the NA version is released I am sticking to that like hot glue.
Aion -- The PvP is what carried this game. Unfortunately, once my guild lost interest, so did I, and I dropped the game despite putting well over a thousand hours into it. One of the few MMORPGs where I actually spent hours just grinding away at mobs and not giving a shit. Also absolutely adore the setting.
Champions Online -- Yes, I play a lot of MMOs. Can you tell? Anyway, Champions Online is easily the best game EVER for players with altitis (and even players without altitis will usually contract it because, gawd, that character creation)! It's just a damn shame that the game wasn't successful enough to warrant regular expansions, and was put into maintenance mode after a fashion. I think that much of this is down to the game's cheesy, Silver Age-inspired tone - if it were patterned more after modern superhero comics, I think it would have seen a lot more success than it did.
Warhammer 40k: Dawn of War 2 -- Including the expansions, I've already put over 300, very close to 400 hours into the game. Still one of my most favorite RTSes ever made, and I still occasionally jump back in for a round of Last Stand.
Supreme Commander: Forged Alliance -- YES. I absolutely love building impenetrable fortresses and doing crazy cheese strategies in this game.
Stronghold (the isometric 2D games) -- DOUBLE YES. Seriously, any game that panders to my inner turtle wins in my book. The fact that I can still jump back into the game to this day and have as much fun as I did as a teenager says a lot about the game's strength, and it's quite depressing that Firefly has yet to produce an able sequel.
Starcraft: Brood War -- My childhood was practically defined by hours spent on UMS maps, both playing others' and making my own, as well as those silly infinite-eco maps that tested your macro ability exclusively. (Those same maps are the only reason I was ever any good at playing Starcraft 2, really.)
Warcraft 3 -- Again, the UMS scene was where it's at. Just beautiful amounts of creativity coming from those map makers.
Counter-Strike (and Source) -- I don't even want to know how many hours I wasted away on this game as a child. How embarrassing.
League of Legends - ...Yup.
Honorable Mentions (and notable omissions)
Banished -- Stopped at a conspicuously precise 66 hours, basically as soon as I obtained my second-to-last achievement for the game (with the final achievement being a terrible, uninteresting slog to get to). If the game were deeper and had more features, I'm certain I could break 200 hours on this game.
XCOM: Enemy Within -- Among my more recent purchases, this one is a winner. 126 hours and still going. Once the Long War mod reaches B14, I will probably give that a shot, and then my days will disappear...
The Elder Scrolls V: Skyrim -- I know, weird, right? But I've only put about 160 hours into it combined, largely because the game is really just kind of dull once you get into it. It's very pretty tho, and I STILL keep modding the darn thing just to take pretty pictures, but as far as gameplay goes it's just not up there.
Dragon's Dogma -- The ONLY reason I have not broken 200 hours on this game is because there isn't a PC version. Seriously. Only reason. Wtf, Capcom?
Soul Calibur (the series) -- I honestly have no idea how many hours I've put into these games at this point. I'm pretty sure I broke the 200-hour mark on IV but I have no way of corrobrating that. Either way, it's still my favorite fighting game series, and I am very irritated that the game has never seen the success of Tekken or Street Fighter.
There's a whole bunch of other games, most notably games played during my childhood, that are not listed here. These were simply so long ago that there's no way I can reliably say whether or not I broke 200 hours on them. But anyway, the list is long enough, I'm sure...
