SimplyCleanExcept for they're terrible in the snow (unless you have a newer one). Don't get me wrong, that car is clean and I love E30's...but RWD is not a good thing to have on a skiing car by any means.
as someone already said, its an IX, which is one of the coolest snow cars you can get, high ground clearance, an AWESOME rear biased AWD system that outperformed subaru's and audi's in its day (though ive driven an IX and I still dont think its got quite the all out grip of quattro)
for a snow car under 15k i honestly cant think of anything that could beat it in reliability, fun/ good drivers car, and pure snow performance. the thing comes alive once it touches snow.
As for RWD e30's and RWD in general. its not bad at all with good tires. an LSD helps a ton. I spent a winter driving a RWD e30 with an open diff, through some very sketchy conditions and some deep snow and it handled it fine.