Healing needs to be better incentivized. Gives too few coins.
In Garden Ops it's really easy to finish with top score (most coins) as a healer. One caveat: I don't know if a healer works well on Insane difficulty. Only made it to level 6 so far in that, but it felt like my lack of DPS was holding the team back even if I did have a hefty score.
In PVP... I wouldn't know. Too busy being silly with the Cactus. Potato mines are its third most powerful ability behind that great main weapon and the dopey drone. I see a lot of drones that fly around aggressively revealing themselves. Do the opposite and you can crank out three air strikes while keeping enemy drones from doing the same to your team.
Drone to do list immediately following launch:
#1 Find cover.
#2 Air strikes.
#3 Prevent enemy air strikes.
#4 Targets of opportunity.
So is it better to get the 40k pack and a guaranteed character or 2-20k packs for more overall stickers?
Getting the 40k packs isn't that great if you play classic PVP modes*. Odds are high you'll get a zombie out of it. The 20k packs will do the same, but it also gives you powerful upgrades. I stick with the 20k packs.
*It seems obvious that one of the DLC packs will include zombie co-op.
Some of the objectives are kind of dumb. I got one as a Cactus to kill my Nemesis three times or something like that. I rarely ever die as a Cactus. Those skip cards are a must.