I don't remember if I've said differently in the past on such topics, but I really was pleased with the Genesis launch period.
Ghouls 'n Ghosts
Phantasy Star II
Golden Axe
Forgotten Worlds
Revenge of Shinobi
Thunder Force II
Arnold Palmer Tournament Golf
Truxton
All of these were fantastic launch and launch period titles to play over and over with. Then, in '90, Sega and friends followed up with great stuff (Warsong, Target Earth, Herzog Zwei, Castle of Illusion, Wings of Wor, Afterburner, Batman, Traysia, Thunder Force III, Fire Shark, Madden 1, Road Rash, Lakers vs. Celtics, Super Monaco GP, and all of the rest).
The controller was so ergonomic and comfortable compared to the PCE/TG-16 and FC/NES rectangles and the decision to move what might have been the select button on those console pads to the main thumbing area made a lot of action games a great deal more playable.
Then there's Sega's mostly silent but much needed standardization of configuration/option modes in the front end of their games and third parties who followed their lead, leading to the first really standard set of features preceding hardware that could offer built-in OSes. Things, like the consistent inclusion of sound tests and music playback with (cross)fading, looping, and, of course, stereo sound available right there on the headphone jack with a fucking volume slider!! Even some titles offered special full-screen sound test graphic displays for channels and cool (animated!) artwork. That shit was way better than some fucking button code to access a box with hex values standing in for named audio file playback. All in all, that shit was futuristic as hell and panning effects were mindblowing for home console sound despite home computers being there way beforehand with 16-bitters in the mid/late 80s. Even PCE/TG16 stuff wasn't nearly as standard in features as Genny stuff...it was something to look forward to messing with besides just the game itself. Then there's the controller-button mapping which was always a big pain to me with 8-bit consoles where I preferred actions to be swapped between the two common buttons. Lots of stuff that we take for granted now...very rudimentary setting stuff.
And what about that fucking gigantic arcade stick?! High quality shit, right there, man. Amazing launch, all around.
The whole experience was fucking incredible, I thought, and it really redefined my opinion of what a new console should offer over just better audio-visuals. SNES, by the time it launched, didn't seem to have quite the impact on me...even coming off a mite bit disappointing, in terms of feature set (though it made up for that with great audio-visuals and some amazing launch titles and SNES-specific hardware features).