This is skill. You need to understand the difference.. A good player can make any combo useful but it doesnt mean its even near to optimal. One guy can play better attacker as Faery than other guy as Undead.
Utopia is all about optimization.
You play different combo each age, alrighty then. It doesnt´t mean I suggest same KD setup every age. But you wont get very far with Undead Mystics in this age setings. Etc an Undead Rogue can single handedly destroy you while you are waiting until your mates supply you with runes. Ask some guys who have warred against NS-ing Undead Rogues this age. NS damage is massive this age. You can destroy undead offense without making a single attack on him. Rogues can be countered true and so can be countered Mystics. This is where 3rd attribute comes in play - you are already in disadvantage with unrealiable rune supply, not being able to steal.