I grabbed an Analogue Pocket the other day, loaded some cores for classic 2D systems on it (GB, GBC, GBA, Game Gear, NES, SNES, Turbografix-16, Master System and Mega Drive) and I've been exploring some of the 8-bit library with an eye of getting some more classic systems and building a small physical collection. Budget permitting, I might pay through the nose and grab the Analogue systems if I decide there's enough games I want for each system (I'm thinking it'd have to be at least 5 all-time greats I cannot get physical copies of anywhere else before I consider buying a console).
There are some absolutely amazing 8-bit games (Mario, Zelda, etc.) but I find most of the games from that era to be basically unplayable. I started playing games as a kid on PC (FPS and adventure games), and while we had a NES in the house the first consoles I really got into gaming on were the SNES and Mega Drive (especially the Mega Drive), so there may be a bit of "before you time" bias to it, but I really don't think 8-bit games stand the test of time in the same way that 16-bit games do.
The notable exceptions for me so far seem to be the Game Boy/Colour games. I know some of them are NES ports, but it seems like Nintendo and other developers really thought about handheld play with a lot of these games and there's an elegance and simplicity baked in that a lot of NES games don't have. I haven't felt the same with Master System and Game Gear games, which so far have not been good. By and large, SMS and GG have been similar libraries of bad games, with the Game Gear ports sometimes having a bit more colour but being unplayable due to the reduced resolution/screen real estate.
I've amassed a small collection of ROMs to try out on all those systems (again: GB, GBC, GBA, Game Gear, NES, SNES, Turbografix-16, Master System and Mega Drive), but if any of you have any recommendations of what I should get/try next then I'd love to hear them.