Just want to point out that being very good and being over or under rated are not mutually exclusive.
Springsteen probably tops my list. I went to college in JErsey in his heyday and acclimated quite a bit, but I find a lot of his music just flat out boring and whiny. I do like some of his stuff though. SO still good, but overrated, except in his home turf in Jersey I suppose.
Kiss is seldom held in high regard musically, so I doubt they are overrated, but nothing special overall, though they were trend setters, FBOFW.
The Stones...other than not being a fan of Mick Jagger's vocals when performing live, I think they deserve the accolades they receive. Mick is part of that formula though, so I would only judge him on those terms. It doesn't really matter how he stacks up vocally against others, though he can hold his own with most pure blues singers, I suppose.
Most underrated/overlooked these days is probably The Kinks.