Winter level completely impossible for Zombies

Not to be patronizing but I've been on many Zombie teams which not only captured the first Garden but managed to go all the way to the end to free the Yeti King.

I've also been on Plant teams which have been able to shut down the Zombie assault at the first or second Garden.

As stated before, success can hinge greatly not only on the individual skill levels of the Players but also the cohesiveness of the team and the tactics used.

On The Frozen North, and any other map for that matter, an assault team which tries to play defensively and tries to stand off and snipe or pick off the defenders from a distance will generally fail if the entire team is employing that tactic.

Likewise attackers who stream endlessly down the same path into defender fire over and over will generally have a hard time as well.

There are multiple pathways and flanking positions and sniping poisitions which allow the assault team to be successful if you're willing to admit when the character you're using or the tactics you are employing aren't working and try something different.