O yes, that the most strong part of a Divnity game: the OPEN SKILL TREE !! Hope Larian never change this in a future rpg's .
I love it to use skills as 'strategic steps' in battles and above all: this is also very enjoyable and give many fun too
Not to forget some (no, many!) 'combinations of skills' you can use one after the other, for example:
* Stun Arrows or Poison Arrows >> Rush Attack >> Firewall
Or
* Hide in Shadows >> Charm or Blind a victime by suprise
* Hide in Shadows > Healing and you stay invisible, the same for summoning your Creature ! (but summoning you rDemon, Ghost or Undead while Hide in Shadows is in action, you become back visible !
* Battle Rage > Rush Attack >> Thousand Strikes ! Attack !