Warlock gets even MORE confusing when you drink an extra-level-something-spell potion.
I will disagree with Thorvic on the Eldritch Kinght, though - they are *really* good.
One, everyone and their mother in this game is trying to Disarm you, be it those godawful Githyanki and their shenanigans or Mephits heating metal, it happens all the time. And it's hands down the MOST annoying thing that can happen. Not only are you losing an action, but you have to fiddle with your inventory and rearrange your hotbar, too. Not getting disarmed is a godsend.
Then, Shield, Mirror Image, FireShield makes your fighter ludricously tanky. God forbid you mix it with Abjurer levels. Add Misty Step to always be in range, and Blade Ward for that odd turn that you're not, and a Magic Missile for when there's a bunch of goons with 3HP left.
Lastly. The game's AI has a serious dislike for anyone concentrating, and anyone concentrating on haste specifically is focused down with extreme prejudice. All the while, your Bear Heart Barbarian is ignored entirely because he can't concentrate on anything. So, you can actually use your Eldritch McTankytank to draw aggro.
