It's not that bad I've just done it in about 7 tries. All I did was move to the right behind cover, toss 4 frags at it then I nailed it with 2 full clips of lancer one of which was a full active reload.
I can see what he's getting at because it's completely cheap and a pain in the arse, but it's not as hard as he makes out, co-op could be a different matter alltogether though.
I have tried 30 times and I can't even get to drive into cover yet. I normally get killed mid roll no matter which way I go. You are right though it's utterly cheap. There isn't a way in hell you could do that section 4 player co-op on insane. If one dies it's game over. The instant splash damage would finish the game

I've left that bit to come back to. Nothing in Act 2 so far has given me much trouble. Gunker damage in act 1 on insane was crazy in places. I ended up rolling around for half hour until they blew up.