Motor Trend's Jason Cammisa does a great job in this Motor Trend video of detailing just what makes E30s so great. He imported and modded his own E30 Touring to his liking, and quite tastefully so. He talks in length about the E30 M3 being practically unreachable and unused, which is a shame. But fortunately there are tons of non M badged cousins to drive around.
Also, Randy Pobst is just a great driver, and seeing him throw the Touring around the track is purely entertaining.