So who chose to be an Operative?

[jeikoo]

So are the 3 classes fundamentally the same?

Commando; bear; best survivability; lowest damage output
Operative; bird; best single target damage, moderate survivability
Engineer; mage; best aoe; support unit; worst survivability

From what I see, int/dex/str appear to be similar

Actually the engineer has more survivability than the operative, not only because it has more armor than the operative but also it can heal constantly as long as u have enough mana.