The Genesis Sonic games are mediocre at best. My opinion, of course. ... I've been dumbfounded since the 90's as to why this series got popular and I'm convinced that Sega has some kind of unholy Demonic Pact which has allowed the series to flourish and basically keep them in business to this day. It's mind-numbingly baffling. Again, completely subjective.
Because they're extremely solid games, with lots of variety, inventive mechanics, colorful graphics, kickass soundtracks, and so on? This isn't exactly a secret or anything.
Granted, heavy marketing also played a factor, but all the marketing in the world probably wouldn't help if the games weren't actually good. They could get away with it in the '00s based on the good will they'd built up in the '90s, but in 1991, no such good will really existed; given Sega was still niche compared to big boy Nintendo, marketing a turd would've gotten them nowhere, fast.
The Earthworm Jim games, on the other hand, are objectively terrible.
Uh, no. No, they're not. Your opinion can, and never will be, objective, any more than mine or any other opinion can. That's kind of how opinions
work.
They're games designed around visual gags. Every single part of Earthworm Jim is designed to distract the player with something visually. The gameplay is hot mess because the designers had to work already poor mechanics around a series of wacky comic book visuals.
While it's true there's a lot of gags in the game, there's really nothing particularly poor about the core mechanics. Shooting is quite solid, whipping is solid, swinging with your whip's solid enough, jumping around is solid... what, exactly, did they get wrong here?
Literally, the only thing I would desire to play less on the system would be anything housed in one of those tall cartridges with a yellow tab on the left side.
I'd only agree with that up to a point - I have no interest in sports games, and that's EA's biggest genre. However, EA still made several good non-sports games for the system - I'm aware the
Road Rash and
[Noun] Strike series are very popular, and I have a fondness for
Rolo to the Rescue myself (first EA game ever, and only Genesis one I own, so).