I have to disagree. The Jaguar was interesting, but it was a very underdeveloped system. And by that, I mean that developers didn't support it nearly enough to make it a worthwhile investment.
The Jaguar is a system that you pick up to be an interesting footnote in your collection. If you aren't getting it for collecting purposes, I certainly wouldn't get it for actually playing games. Aside from the extremely small selection of enjoyable titles, (and the not-much-bigger selection of crapware) there is the fact that the controllers for the Jaguar well and truly sucked. The things make the XBox Duke controller feel small and conservative.
For acquiring hard-to-find quality games, you would be better served purchasing a Sega Saturn. (one of the most notoriously difficult systems to emulate)