Here is my opinion. I think the game starts off slow but it gets better as you're further into it.
Although once you have beaten the game it can get quite boring at times. I've finished the game
And I'm farming items now but it gets boring and repetitive in doing so. I have a lvl 50 siren completed
Both playthroughs all side quests, making an assassin now completed 1st pt. Also have other 3 vault hunters
Up to sanctuary. Overall game to me is fun but I get bored of it once I hit 50. Nothing to do once you're 50.
I do play with friends ( vermi, terra) but it's too easy even without bee shield, and without bee it just takes too long.
Anyway I feel like they need more content, harder bosses, harder arenas or something to keep it goin for end game.
8/10 for game generally
6.7/10 IMHO for end game.

I guess I gotta wait for the future dlc for better review/opinions on game