The bad
Inquisitor - skills have no synergy with the default weapon and stat line distribution for this preset and forces you to party with something capable of shreding physical armor in order to CC properly.
Aerothurge is a way better skill line to have than Necromancer on this preset because it buffs the damage from staff,regardless of what element you have on that weapon.
I made a dwarf Inquisitor once and made the Red Prince a knight. The dwarf inquisitor with the sword was a beast and the Red Prince was surprisingly capable at combat with the staff and default abilities of the Knight...but there was room for only one melee executioner and the prince had to go.
Perhaps with the release of the dwarven companion,you guys will see just how good the Inquisitor preset can be at low levels...when you trade that silly staff for your default melee weapon obtained from your Knight/Fighter preset.
The meh,average
Battemage - I had dificulties in enjoying this preset so my opinion here is highly biased,but I strongly believe that the Battlemage should have started with a staff, so that the skills synergise better during the first 4 levels and at later levels due to the str investment get a two handed weapon - it's not that hard to keybind a huge axe and a magic staff to the quick cast bar.
Conjurer - a pure support class which relies at low levels on the RNG of Dimensional Bolt. What ruins this preset for me is the God awful stat line distribution at character creation.
I would recomend +2 in Wits (this in my opinion is the most important stat for a summoner,you have to get your dudes out before the enemy attacks) and +1 in Int over the +2 in INT, (which is overkill,the damage from Dimensional Bolt is not worth it) and +1 in Finesse (Larian did you guys just dumped a INT/FIN hibrid on us out of boredom at character creation?)
The fighter - My only problem with this preset is one skill, Contamination.Why? It's pointless for a tank. Could you please replace it with Battering Ram. Contamination on a fighter is only good if the fighter is a Zombie. Mobility skills for a tank trump utility skills.
The Good
Here are the builds I feel,work as intended: Knight,Ranger, Metamorph
The ones I didn't have time to use:Rogue, Shadowblade,Witch,Wayfarer.