People had trouble with this?!
Even Dr Zomboss' Revenge (Minigame) was a piece of piss. I did it first time. What are people doing wrong?
Survival Endless is way harder (but still not very hard) with those constant Giga Gargantuars.
There is a small element of luck involved in most games and this boss fight is no different. Just use your plants effectively and hope he doesn't spam cars & ambulances at you. Apart from that and the occasional Bungee Zombie slowing up your assault, the rest is a cakewalk.