What makes it your favorite? Do you want to play it? If so, what's keeping you from doing it?
For me, it's Burning Wheel.
I bought it purely based on aesthetics back in 2008ish, then got the supplements, then Gold, then Gold Revised, with the Codex, and the anthology...
I blame it for my weakness for chunky, digest-sized, hardcover RPGs. :P I also like the graphic design, I like the prose (even if it's divisive), and it has both interesting lessons you can plug into other games (like "let it ride," letting success or failure stand instead of making lots of little rolls) and arcane systems that pique my interest (like the Artha cycle, which makes roleplay, metacurrency, skill rolls, and advancement all intersect). I genuinely like reading it for its own sake.
I haven't played it because... well, since it's not D&D, that immediately makes it harder to get people interested, sadly. It's also a bit daunting, given its reputation as a crunchy system. But I have a group of players interested in trying new things, and fewer other games calling for my attention, so hopefully I'll get a chance soon. :)
If the players are demanding wild results, especially if they're the kind to roll unprompted, then sure.
But in my experience, it's usually just a little flourish or a small bonus, which I think is fine.
And if the issue is that a nat 20 doesn't guarantee success, technically, sure, but I'd be more annoyed being asked to make a pointless roll. I know there are reasons, like a hidden target number, or other characters being able to do it, but in general, I'd rather just hear "no" than go through a pointless check.