the 2 most recent Rayman games are in an elite club of platformers that rank as the best of all time. I would venture to suggest that Rayman Origins might actually be the best platformer ever. The humor and silliness of it all, combined with really great graphics and an epic soundtrack make it heaps better than most other platformers out there. Legends was also pretty good, but Origins was such a polished masterpiece that I don't think they were ever going to be able to top that.
I was super excited about the Jaguar when it came out but what a piece of crap that system was. Plagued by the usual problems that filled the halls of Atari throughout the 80's, the Jaguar was their last attempt to remain relevant and boy did they ever drop that ball. The hardware was far more powerful than their competitors, but it apparently was damn near impossible to program anything for it .
I don't think that the Jaguar was any harder than other systems of the time to program for. Or the ones that would come shortly after like the Saturn anyway. However, Atari repeated their mistakes with the Atari 7800. The hardware was great but they were too cheap to spend the money that needed to be spent to develop high quality games and they did a poor job of courting third party developers. I'm sure they probably didn't produce developer tools to the level that Sega, Sony an Nintendo did either. The Jaguar had the power, timing and price to be a very successful system. It's amazing how Atari managed to screw that up.