Completed the main story last night, felt like the final battle was a bit of an anticlimax but I think that's mainly down to being a level or two ahead of the curve and by that late stage of the game you're kitted out like a motherfucker. Still lots to do, had a go on the Slaughterstar 3000 with my girlfriend but she tapped out on the last level because the split screen still has massive issues on PS4 (we completely lost sound for most of it, and one of the enemies glitched so bad he couldn't be killed with a gun).
Will investigate the viability of platinum, but I think that looks pretty likely.
Fun game overall, it's just Borderlands innit.