Wrath of the Forest is great in my opinion, and often more useful than the Ranger's Hideout's poison.
Being able to hold several enemies on the same place for multiple seconds is very handy and it instantaneously kills skeletons
I do agree that the Barbarian's net ability is a fail though. Luckily the devs adressed this in the iPad version by changing it
to whirlwind, an AOE damage skill, but I would like to see the same change in the flash version. The barbarian's 2 axes ability
is really important for them to be useful though, as it considerably increases their damage output and I like that one as it is.
And the Tesla X104 is indeed weak in comparison to the Big Bertha and is actually only really useful in wave 2 of heroic level 10,
by being able to kill 85 wulves using its overcharge ability. It looks way cooler though, and I would love it if the devs would upgrade
the Tesla. There's a really simple way to balance artillery out: change the Tesla's damage from physical to magic damage and you're done ^^