Nah, they're pretty good
I have a blast when I take my old one for a spin...even though I normally ride my XJ900 now.
Umm...just check the usual if you are buying secondhand...fork seals, brakes, chain condition, tune, shock action, tyres. Engine should pull nicely and rev out cleanly. Gearbox should feel good, not sloppy.
I spent more money on mine than most people reckon is sensible - rebuilt forks with gold valves and new shocks on rear - transformed the bike completely, and didn't cost much more than a simple overhaul.
Cheap to buy, run and insure. Easy to maintain yourself. Can do long distance too. Seat not necessicarily (sp!) the best, but ok if you can stop and stretch your legs every now and then on longer rides.