Civvie11- Mostly covers old PC first person games games
I Finished A Video Game- Has very long in depth retrospectives covering the history and quality of game franchises like Castlevania and Parasite Eve.
Jeremy Parish Video Works- Uploads weekly covering (usually in chronological order) the releases for a console. Currently he's covering NES games in NES Works, but has also series for other consoles like Game Boy, Virtual Boy, and SNES.
Kim Justice- A good variety of reviews, documentaries, best and worsts, and top 10...or 100 lists covering European retro gaming history.
Lute- Very chill and laid back videos covering games the creator is passionate about.
tangomushi- Covers retro horror games
ThorHighHeels- A little more unique, this channel mostly covers Japan only games along with their aesthetic and very weird obscure games no one really talks about.
Describing why I like something has never been by strong suit. I just thought these channels were good and a nice change from the norm of reviewing bad NES games, look at how bad Sonic 06 is, and a collector finding a hidden gem or rare game for a nickel.