The grow stage was pretty easy for me ((a patched version perhaps?))
Also - the boss is really easy - just stand at it's legs - the attacks don't get there
Yay for Megalomania+Anti-Taint cards :D
As for insanity not being a handicap - some kinds are - Schizophrenia is quite some trouble, Xenophobia is not much of a trouble, Agoraphobia can be seriousely annoying and Megalomania is AWESOOOOOME (as long as you have ways to counter taint and not getting dispelled :D). So insanity is pretty much a gamble that can be a boost with right conditions or mess up the match big time.
Beaten it on Hard... when doing it on Hard it reminds me of Line Rider... you need to memorize the whole track... sometimes you even need to go ahead before the screen catches up...
There's a couple of annoying things: When the ragdoll gets stuck on the circles and that when you get blown up it takes way too long to restart...
Whew... beaten level 8 (had to use steel though, but on limited money)...
A little hint - shorter pieces seem to be weaker than longer pieces (they were when I was playing :D)...
Top armor and Proton accelerator makes you an unstoppable killing machine - you don't even need to bother to dodge... And upgrades for teammates would be nice...
Stolen or not - I found the game quite decent... although some weapons are seriousely overpowered... and it needs to have more than 1 on 1 matches... at least 4-man deathmatch would have been good... I also don't really get the idea of recoil... I haven't really seen any significant effect from it...
Suicidal seagulls, diabolical skydivers (how else can you steal the limbs of other people?), homicidal ravens and Helicopters-turned-killing-machines... What else do you need? :D
Well, I've done most of the game using just the Bow and the Chainsaw: Bow has decent damage (at least for headshots), accuracy and good reload time, while Chainsaw can mow through any number of zombies :D I also found the beginning Pistol and the Shotgun kinda good as well...
As for the thing about running fat zombies - they were in the First game as well... and thank God these zombies are too dumb to shoot with weapons :D