Titanfall isn't as revolutionary as the hype would make you believe. At its heart, it is a COD style shooter with the pace ramped up. There are elements incorporated into the gameplay that haven't been mixed together in the FPS genre before, but nothing that hasn't been seen in other first person games.
Now, I'm fine with a game being multiplayer only, but it needs to be one hell of a multiplayer experience, and Titanfall just doesn't have that. Essentially you are paying full price for a multiplayer game with only 4 game modes and 15 maps.
The interesting elements of Titanfall are the parkour-esc maneuvers you can do to get around the map, which brings to mind the very fluid movements you could achieve in "Mirror's Edge", and the ability to summon a mech to climb inside and blast your enemies with. Unfortunately those features just don't seem to fit together too smoothly, and makes the game feel more like a mish mash of games, rather than a whole new experience
There are no leaderboards, and the game doesn't keep track of your k/d ratio or any of your stats for even your own personal knowledge, so you never feel like you should keep playing to achieve something or get better. A multiplayer game really needs something like that, or else it feels shallow, and when all your game has is multiplayer the last thing you want is your game to feel shallow.
All in all, Titanfall isn't a bad game. If i saw it on sale for a good price then i would likely pick it up. At it's current price tag though it is definitely not worth it, and i am thankful for the Origin Great Game Guarantee so i could get my money back.