Ugrumov was a GT contender for some years actually. 2nd in the 1993 Giro, 2nd in the 1994 Tour, 3rd in the 1995 Giro and 7th in the 1996 Tour. Quite consistent and far from a one-hit wonder.
(Of course he only began shining in his 30s, when he rode for Mecair/Gewiss, and exactly at the time EPO made all the difference before everyone started using it)
Bobby Julich was very lucky to finish 3rd in that Tour because of how many contenders couldn't finish, but he was terribly unlucky afterwards. Still, he had already been 9th in the Vuelta and 17th in the Tour. Not impressive, sure, but my point is Wiggins still has to get to *that* level, get at least another couple of good performances before he can be taken too seriously.
So actually I'm agreeing with you I suppose.