A very general one but
Guitar solos
I used to love them but something very irritating to me right now. I appreciate the skill and expression but much prefer guitars to be part of a background, or well like riffs and that, than jizzing all over my face if you'll excuse that expression. I think acoustic sounds nice actually, just something about electric ones that does nothing for me and irritates a little
Well i'm a Guitar player myself and i kinda agree with you. I fucking hate those long, pointless wanky guitar solo's performed by egotistical narcissists more interested in their own brilliance than that of the song they're supposed to be serving. Jimmy (sloppy as shit) Page, Richie Blackmore, all the prog guys save for maybe Robert Fripp, all the boring blues wankers like Clapton, Beck etc basically almost anyone on those greatest guitar player lists you see.
Then again there are some brilliantly underrated guitarists out there who know what to play and when to play it, George Harrison is one example, Dave Gregory from XTC is another but then i don't think you're talking about players like that.
Anyway my overrated list is as follows Led Zeppelin, Pink Floyd, The Smiths, The Doors...in fact most of the "classic rock" canon does absolutely nothing for me, truly great pop music kicks the shit out of rock music. I'll take The Kinks, The Beatles, The Zombies, ELO, Abba, 10cc, Sparks, XTC, Blondie, Tears For Fears, Pulp over any of the supposed classic rock bands.