It's fun, much better then the previous entries but not really worth the $60 price tag. Career mode is fun once you start, but it gets repetitive after awhile. Two things they did really well with this game is the striking and fighter individuality. Fighting against Eddie Alvarez feels much different then fighting against Dustin Poirier. Eddie will constantly be in your face and moving forward, whereas Dustin is content to stay on the outside. The fighters move and fight like their real life counterparts.
The way the devs explained it is that on the easier difficulties, the AI won't resemble their counterparts too much, they'll be more of a base fighter with different attributes/move sets. But once you play on normal/hard, you can really see how much they resemble the real life fighter. All in all, it is a fun game.
But I would say wait until the price drops to around $40, simply due to the lack of overall content. Unless you have money to spend, then go pick up a copy.