I got this game a few days ago and I tell you honestly it was the absolute best game I've spent money on! I haven't even finished the game yet and I already know I'm loving the challenges and boss fights. Yes they're hard and that puts some people off but it just makes me step away, analyse whats going wrong and apply that knowledge to round 2!
I was so surprised with the customisation ability too, you can literally design your dream mech! With all the improvements and mods you can add its not only got the most awesome mechanics of a mech game i've played but you've also got awesome looking AC designs. Fighting opponents with their own unique designs is also inspiring when it comes to customising.
I've read that a lot of people complain about the pvp aspect of the game, but if it's that bad don't stop playing this masterpiece of gaming, just steer yourself away from that aspect of it. Replay the story. Do the arena. I know thats what I'd do.