These are game element stories (mostly with level systems) that are either action-packed or great on the power fantasy side of things -- the MCs either begin OP or gradually become OP. You won't find any pushover MCs here, either, or MCs that waste chapter after chapter chasing skirts. Don't judge these by their covers -- some are a lot better than the cover art would lead you to think, like Night Ranger, which I put off reading for a long time. It turned out to have one of the most interesting D&D-like universes I've ever seen.

There are many other series I enjoy, but as much as I'd like to include them, I'll only put something here if it's REALLY addictive. Too many series start good and then waste their ideas.