Well, my current build i was playing makes use of every single button available and a weapon swap with more skills. Which is actually way more than D3. So ya its waaaaaaaaaaaaaaaay more than 3. But even before i weapon swap i have 9 skills at my disposal. Last i check 9 > 6.
I can raisie zombies, skeletons, ghosts while using a cursing totems and corpse explosion. And thats even before any actual attacks...lol
Honestly, it does't matter how many buttons it takes to take down hard content. I can say NONE because i built a pure summoner that can overrpower most of the harder content i faced with my summons.
I don't really see why you consider it boring?
I mean, the 1st PKr i ran into i pretty much fed him to my army and splattered him to death...
Anyways, i don't see what you're getting at since i stand there and use one skill to kill things in D3 all the time. And the funny thing is D3 has less of eeeeeeeeeeeeeeeeeverything.