For me, I'd have to say Old School X-COM (UFO Defense, TFTD, X-COM Apocalypse to an extent). I love them in a way that I just do not enjoy NewCOM, but the interface was quite possibly based on the recovered works of a 13th century scribe, and is very difficult to get used to for an unfamiliar player.
Hit chance being the way it is is fine. If it bothers you that much, you can just throw money at the problem via trainers.
But magic not regenerating is the one thing I always mod to fix. Just annoying to take a half-week long nap or keep a shitton of potions every time you get into an encounter with magic.