These games were probably decent when they came out.
Nah, most were mediocre even then, 5/10 at best, Power Drive Rally being the only exception IMO.
Other than that, Jaguar only had Rayman, AVP, Tempest 2000, a good port of DOOM and the best looking version of Wolfenstein 3D.
For me, the Jaguar was nothing more than a cheap way to play a good port of DOOM in 1994. I say "nothing more" now but back then it was a big deal for me. It was a "dream game" for many people after they saw it running on a 486. Atari missed the opportunity to market the shit out of this port and make it the "killer app" for the console. Think about it, for some time this was the only way to play DOOM without having to own an expensive PC. It was also better than the 32X version that came later. Instead, they chose to push AVP, which is good but also a far less advanced game, which is not a great idea when you try to sell new hardware based on it's power.
Rayman was also a superbly looking game, i remember it being the first time i though "hey, this really looks next gen". And again, the Jaguar was the cheapest console to play that game and it looked just as good as the PS1/SAT versions.
Wolfenstein 3D looked far better than the PC original and it was very similar to the 3DO version (which was a much more expensive console). But hey, it's still Wolfenstein. Even with its improved sprites and textures it still looked obsolete in 1994/95.
I never liked Tempest 2000 myself. Never understood what the fuss was about. The trippy graphical effect maybe? The music? It's still a port of an ancient arcade game.
Since then i have checked the whole library and the only game that stood out to me was Power Drive Rally. I kinda like the pre-rendered sprites and it looks a bit better than similar looking games on the Arcades/Neo-Geo.
The Jaguar performed really well with the DOOM engine and i assume it would be able to handle the Build engine with some downgrades. Games like Heretic/Hexen 2 and later on Duke Nukem 3D/Blood would do the console wonders. FPS games became huge in the PC space, the Jaguar had the time to become the console ambassador way before the PS1 was affordable enough or the N64 changing the game with Turok and Goldeneye.