Just finished the first play thru. Pretty good ending battle, I just wish Mordecai ad Brick made it to the end fight and didn't just disappear 1/3 of the way in. Claptrap stole the show at the gates.
The best part was I had just finished the Hyperion bandit killing quest and was awarded a new Sniper Rifle. I hadn't had a chance to test dirve it, so I though I would during the gate battle. It was hilarious. I'm affectionately calling the rifle "The Ex-Wife" because she is priceless. Throughout the battle I'm cursing all the War Loaders that are dropping in and then laughing my @$$ off everytime my rifle tells me that they come from a "broken home". What a time to choose to run that gun.
Generally, though I did find it too easy to run thru the level and just get to the Warrior. I tried to fight it out at first, but once I lost Mordecai and Brick, I just dashed past most of it, stopping only to take on the heavies. Jack was moderately easy, since so many of his doubles make for good Second Wind fodder. The Warrior was boring as hell. You get to the high ground area where he first spawns and just light him up. He never attacks you, it's just the one lone Volcanic Crystalisk and maybe the occasional Volcanic Rakk (How freaking annoying was it to have infinite spawning Rakks in a boss fight? Of all the creatures, they choose that one), which can dropped easy enough. The loot was pretty decent, but this means I completed the entire game (save about eight side quests) and only got one Legendary weapon. And that was early on in the game - Slippery Kerblaster, which became useless after awhile.
Overall, I like this one alittle better than Borderlands 1, but I think it still had some negative points. I'll probably do another playthrough with another class rather than go thru playthrough two.