I would say go for it. Titanfall was/is a GREAT game! I've spent prbably over 100 hours shooting pilots in the face (and vice verasa Lol). I have it on PC and while the game wa a blast it alwys felt extremely limited. The game got stale real real fast and now it takes forever to find a game anymore. Getting it on the Xbox though is smart because I would imagine the game still has a large community on the ONE. The main thing that is a major let down is he graphical fidelity on the Xbox one. My 4 year old PC with a GTX 570 is able to play the game @ full 1080p @ a steady 60 fps even in a Titan. Yet this brand new console can't handle the game well @ 1080p? Not impressed.
So heres a run down. The game is alott of fun for awhile but grows stale quickly. Even with the DLC there aren't that many maps. The only game mode anyone ever plays is attrition and its the same wash and repeat strategy every game. You can't customize anything on your titan aside from a few weapons, a useless voice, and insignia. Choice of weapons is terrible as theres only a few guns worth using.