How do you build your teams and decide what classes you use?

Hello. Question is in the title.

I'm always a little bit unsure how to build my teams. One of the problems is that some classes play vastly different depending on what passive you get.

I personally look to have some frontline (often Butcher and/or Necromancer), one support (druid or cleric), one damage dealer and one flex. What are your apporaches and what have you learnt?

ATM I really like the Tinker as a DD/Off-Tank. First I didn't knew what to do with him, but I hade some insane runs, especially combined with the Druid. He can do a lot of damage while having some respectable sustain and if you get a lot of minions with both its very dangerous.

Just unlocked the Psychic and I'm looking forward to play with it.