Not quite sure what you're getting at as all those new plant variants are definately used a lot, and as far as the soldier class is concerned you still see the original, arctic, camo, general, centurian etc in game. Basically all of them are fine.
You could say the zen cactus is overused for gods sake. Must be OP...
Everyone knows who the real culprits are. This list contains some that aren't really a problem imo.
PS Whilst I can't say I like the rock pea myself, others seem to though.
I wasn't getting at anything, just throwing a compliment I guess.
Zen Cactus was nerfed, and people are still playing it because it's new :P
