Titanfall is a beautifully created game. Fantastic graphics and great gameplay. I played the beta upon release and was quite stoked to get the full game upon release but my excitement was short lived. My pros and cons:
Cool new ideas not seen in previous FPS
Top notch graphics
Seems to be different players than the CoD crowd which to me tends to be a younger or more immature crowd, constantly cussing and chirping others for irrelevant reasons, often unrelated to the game. Titanfall players seemed more mature (in my short time of playing)
No story really. The "story" is just the game putting in a short cut scene before the fight or during your fight they will talk to you in a small clip in the top corner. The story is still all online play which is team deathmatches and domination essentially.
Very limited weapon selection with not much customization to them.
Excitement is not long lasting as the concept is cool but dies off quickly. My disc entered my Xbox one no more than 5 times
If your a low generation or not the best player, good luck. I kept on getting paired against people who would be Generation 5-10 when I had just started, therefore it was frustrating constantly getting killed and seeming like there was nothing I could do to even hurt them, that said I am typically a stronger gamer, often placing in the top 3 in BF3 and BF4 matches, as well as top 100 in NHL in some cases.
Summary: Great concept with good gameplay, just needs more features like offline story mode, more weaponry, and ultimately more to keep you interested