My big gripe with the SFC is that almost all the games have aged very poorly compared to the other systems.
Even the "omg look" games like R2 use basically one background on loop for an entire stage at a time. Mario World,
DKC, all have like 4 different backgrounds and they loop again and again. Who cares if the game goes on for 3 hours if every stage looks the same.
You must
HATE Neo/Nectaris and many Turbo/PCE games then.
If you can't use variety, then the stages shouldn't go over 2 mins. That damn raft ride on chomakaimura is the exact same thing on loop for over 3 and a half minutes, die and you do the whole thing again, the hardest part of cho is not falling asleep to it.
What about RPGs?
Megaman X is all kinds of awesome, until you realize there's only like 3 enemies on screen at once, all that speed but so much empty space...
You don't need a screen full of enemies for good or fun gameplay. One of the biggest problems with 16-bit games is when they try to throw everything but the kitchen sink into each screen just for the sake of differentiating it from 8-bit games. Instead of just concentrating on what makes a game good.
Here's how I judge the systems by games
PC Engine: ports of the most popular arcade games, legendary shooters, decent platformers
Megadrive: ports of the strangest arcade games(Toki, Two Crude Dudes, Chelnov), average shooters(even the Toaplan ports), boring platformers
SNES: most original games, few good shooters(Gradius III, but really hard), excellent platformers, ZELDA!!!!
I guess you really haven't even seen videos of many PCE games, let alone played them. No one who is familiar with the PCE, even if they're a Genesis or SNES fanboy, doesn't agree that the PCE has the most original and best selection of the "strangest" games. It also sounds like you limit yourself to the kinds of games you play in general, since even when summarizing the legendary SNES, you don't even mention RPGs.
The PCE is actually the weakest of the three consoles for ports of the most popular arcade games, for non-Japanese players at least. The PCE is loaded with ports of great arcade games, but most non-Japanese players haven't even heard of half of them. The PCE also has very few straight-platformers. There is a lot of great platforming gameplay in PCE games, but they usually mix in other gameplay as well.
It sounds like you're just a SNES fan who is beginning to try Mega Drive and PC Engine stuff. There's nothing wrong with that, but you shouldn't try to judge the libraries before you've experienced much of them. You're also better off trying games in emulation before buying them instead of asking for opinions on whether they're worthwhile. You obviously have specific tastes. But if you give some of the hundreds of PCE and MD games which don't fall within the genres you traditionally play a chance, I'm sure you'll find many games you'll love and open up a massive range of games to consider for all consoles, even SNES.