What I've played so far and my thoughts. I've exercised a lot more caution since the new year for better or worse.
Solomon's Key - Worth it - I didn't like it but my friend got such a kick out of it
Super Mario Bros. - Absolutely worth the 5 bucks
Super Star Soldier - Worth it - Haven't played it much but a little shmup here and there is always nice
Gunstar Heroes - Not worth it - Great in 2-player but a bit of a grind in single-player
Sonic the Hedgehog - Worth it - Top-notch platforming and looks beautiful
F-Zero - Not worth it - still a tight racer that holds up well but little replay value
Street Fighter II - Not worth it - Bought it to quench nostalgia but I sucked out most of the value years ago
Super Castlevania IV - Absolutely worth it - Great music, good challenge, good level design
Mario Kart 64 - No opinion - Not a big fan to begin with but I know it would make for good multiplayer later
Total
$66
What I'm waiting on: Adventure of Link, Super Mario Kart, RPGs, more Castlevania, Mega Man, DKC2, Punch-Out