I'm with you on Marr - and Moz, to an extent. I think they might have been more universal with someone else, but that's not really what they were about.
I know he's a total nobhead and his voice puts people off, but I think The Smiths are all about the disenfranchised, the lonely and the melancholic - including Marr's playing. There's plenty of melancholy in the guitar playing. My Dad would occasionally stick his head round my bedroom door and say, "Bloody hell, are you listening to this bloody dirge again?" He was under the impression that I played one song continually and I didn't. It was mainly The Smiths, though.
I saw them live once - it was mental. Maybe it was because I was young and didn't have much experience at gigs, but maybe not. I've not been to a gig since that was as fanatically received as that since, though. Not even The Roses.
That Moz is now a dick doesn't colour my enjoyment of The Smiths though.
I wouldn't go and see them if they reformed, either.