There's nothing wrong with a well-set-up rear solid axle. It's a bit old school, but gets the job done just fine.
I think my dad's 1990 5.0 LX has the 2.73s. It's a light enough car to pull well around town (and it'll light the tires up easily), but on the highway, it's great. If it's got the 2.73s (I'll have to check at some point), that's only 1700 rpm at 70mph. That's TALL gearing, and I'd love to have it in the Jeep (3.73 axles, 2050 rpm at 70mph).
The V6 with 2.73s would be great for someone who wants a decent RWD daily driver than can be a bit of fun. The 3.31s are for those who want it as a performance toy, or who use it as a DD, but don't spend much time on the highway.