1. Every map is fantastic. You don't feel the need to skip any map. All maps feel well balanced and you rarely have any "spawn campers".
2. Even if you suck at shooters, you can still rack up a lot of points by fighting the bots to get a hang of the game.
3. Traversal battles are amazing. Its feels very fluid and very smooth. There is no more campers who get to the top of the building that no one else can. You see something in the map? You can reach it, whether you reach it by climbing or ejecting a Titan is up to you.
4. The starting weapons are the best. You don't need to go unlock weapons as all weapons feel evenly balanced, with the starting weapons being the most useful. The starting 3 classes for Pilots and Titans are also good enough for you to not feel at a disadvantage.
5. Great multiplayer Campaign. As much as it's a multiplayer game, the campaign feels fun. You are still playing a multiplayer but with a story supporting the events of the battle.
6. Burn Cards are a great way to have some advantage for that life of yours. They work great, they give you a slight buff but will go away if you die. Its a very progressive transition for the "deathstreaks" in previous games that do no good.
7. Perks/Abilities are balanced. In Call of Duty games, they're some of the worst things I've seen. In Titanfall, they're all balanced and none will give you crazy advantage and everything has a balanced counter.
8. Titans are amazing! I hated the idea of Titans as Killzone had ridiculously bad mech balance. In Titanfall, fighting a Titan is very balanced and playing as one is too. You can take down a Titan as a pilot very easily, and you can take down a pilot as Titan easily too.
9. The match completion sequence is so awesome that you don't mind if you lose! In fact, I've won so many battles that I don't mind losing once in a while so I can escape. Basically, both sides have one life when the match ends and you have to escape as the losing side, while the winning side prevents you from escaping.
10. As noob-friendly it is, skilled players can dominated if they play well.
11. You are a total badass even without trying. Games try way too hard to make you this badass character that feels fake but here they barely try. Amazing environments and music! Music makes it feel so intense and badass! Your commander admiring your skills is also a great feedback that every game needs. No one wants to hear someone pissing on your mom's grave all the time so its great to hear commends and praises even if its the A.I. praising you. It pushes you to continue the streak and I have.
The biggest problems with Titanfall is lack of matchmaking. Seriously, there is no scramble, no nothing. If your team is good, prepare to dominate for the rest of the hours. People leave the lobby because of lack of matchmaking and it needs to be fixed in future updates ASAP.