DND_Reborn
The High Aldwin
While I like some of the Invocations, the class really doesn't appeal to me. We made it a subclass of Cleric and that works fine for us. 

That doesn't sound all that useful an ability for an adventurer.Listen, if you stumble into and knock down a witch in a tavern, you should expect to get home and your cows will all be dry, or your wheat fields will be full of rust, or you'll have nightmares of being ridden like a horse.
Depends on the character! Some characters prefer the subtle approach! My character in our Battletech Hero game is very much the kind to hack into a computer and find out the information we were expected to find by assaulting an enemy stronghold. But I figure so long as we eventually get into a scrap with the big stompy robots it doesn't matter if it's to my character's design instead of the patron's.That doesn't sound all that useful an ability for an adventurer.
It's a matter of style.You're either minorly inconvenienced or brutally murdered by magic, with no in-between? That's a...dubious binary. Apart from "I just prefer it that way," why wouldn't a warlock be able to do everything a witch could do, and vice-versa?