Yes, you are right. I thought, this effects only towers.
I have finished the game and missing one achievement.
How to get the "Barbarian-10-kill, are you entertained" achievement?
Does it really mean, one from the three barbarians needs to kill 10 enemys alone?
My conclusion about the balance is a bit similar from Eddy01741 on page 10.
Paladins > Barbarian --- its better to build a mage or archer instead of the barbarian throwing axe special, and/or spam legions if they can hit flying enemys. A paladin can block, heal and do holy damage. The barbarians dies to fast.
Only good for weak enemys, but for weak enemys, paladins do enough damage. I think, the net from barabians are the most useless special of the game.
Archers > Musketeers --- 750g for sniper or for poison? I play very rarely with archers/muskeeters, but then i often choose poison. The roots+damage helps a bit more. Give you a bit more time for the next rain of fire or legions.
Big bertha >= Tesla --- in my experince, the big bertha with missles (and aoe damage) over the map and the grenades + the bombs is slightly better.
Wizard = Sorcerer --- they are really twice good, one do more damage, the other one halfs the armor (passive). 350g for golem is a bit expensive.