For the first time ever I witnessed the plants win on this. I was on the plants team and I had someone on my team who had the same idea as me - to hold down the teleporter. We prevented them from getting their teleporter up and didn't really let them into the main garden (with the bridge).
Even with that considered though it's definitely too easy and in favour of the zombies for two teams of equal skill. If the zombie team were any good they could easily have got their teleporter up (think they only had one engineer and a scientist even intererested in fighting for teleporter control).
I think it needs to be made harder for the zombies. It's just way too easy to jackhammer your way in and there's not much the plants can do about it. Maybe if the zombies were prevented from using their "Y" movement ability in the final area (with the bridge) even that would help the plants a bit.
