TB and QoT have 6 active abities you can level !
and this comparison to Dota is completely wrong:
DotA: 4 abilities to level, but many heroes have only 2 or 3 active abilities, rest is passive.
DG: ervery DG has at least 4 active abilties, TB and QoT have 6......beside a couple of passive abilities !
this makes every DG much more komplex than any Dota hero !