Horizon is the hardest part of ME2 insanity by far, but it's not like the rest of the game is a joke afterwards..
Cool. Now go play Cthulu Saves The World. $3 and more awesome RPG gameplay.
Actually, I just recruited Santa Claus.
The game's pretty much Breath of Death 7 + as expected. I really do love the new insanity status in this game (drops enemy defense, change their character sprite, may make them a lot stronger). And poison is actually useful!
The main problem is that it's tiring to see Cthulu get trivialized again and again everywhere, and the whole game is that.
Character ratings (with my builds)
Cthulu: Worst character in the game, and he's forced. He has some alright ST damage.
Sharpe: Best ST damage. His magic could have been good, but I don't think he could ever compete with October. Good against bosses.
Dacre: Pure healing battery, worthless against random monsters, probably great against bosses.
October: Pure mage; Great MPs, uber strong magic, and she could have been even better. MVP.
Umi: Umi's a hybrid, she has a little bit of everything. Right now she has all the water boosting equipment stacked on her and she spams Flood. Works.
Paws: Useless, except for that skill which makes every enemy insane.
My main team is Cthulu + Umi + October + Paws, but every character, even those dead or not in the party, get full exp, so there's a lot of freedom. More games should do that.