I think that for me it would depend on how expressive it was. I remember once that myself and a couple friends got free passes to a Terry Bozzio drum clinic in CT. I think we were there for five minutes until we were out the door. Are you expressing something or just wanking? I feel that way about all solos, guitar included.

Without drum solos, we would never have time to go to the bathroom.

I love a good drum solo. When I was around 5 I got my first drum set and I have vivid memories of watching Buddy Rich on the Mike Douglas show and going to my drums after to try and duplicate what I saw. Perhaps I can appreciate a good drum solo because I have seen some of the best drummers on the planet do them.

Mike Mangini is without a doubt the best drummer I have seen, probably the best in the world, certainly the best rock drummer in the world. He now teaches at Berkley and holds the world record for Worlds fastest Drummer. When he was playing with Rick Berlin, I saw him close to 100 times and at every show there was a drum solo. Every one was brilliant. Great timing, not too long, amazing rhythm, just the right lenght of time, all the things that I think make up a good drum solo.
I saw Mike recently in the audience at a Dream Theater show and I am sure it was planned, he got on stage with Mike Portnoy,(In my top 5 of best rock drummers, also a Berkley guy)
They did a double drum solo on Portnoy's enormous kit and it blew me away.

One more example of a great drum solo was at last years Phil Collins show. I think most musicians recognize Phil as a great drummer first and a crappy songwriter second so when he started his farewell tour shows off with a 15 min drum solo off I was ecstatic. he came on stage alone, started the solo, then was joined by Chester Thompson (longtime Genesis/Phil Collins touring drummer, also with Weather Report) for their "Drum duet" that they first did together in 1978, then were Joined by a percussionist and you had this amazing full sound that filled the place. It reminded me of a great boston band from the 90's called Concussion Ensemble.

Anyone remember them? 5 drummers on stage at once with a guitarist and bassist. Instrumental songs based around this wall of percussion and I never got tired of seeing it live. It didn't translate well to the 45 I bought but I still saw them live whenever I could.

I am not a big fan of guitar solos but the G3 tours always do well. I propose a D3 tour. Mike Mangini, Mike Portnoy and Terry Bozzio drumming all night long. Each year then can rotate in different drummers, Neil Pert, Dave Ghrol etc. I would spend good money on that.