It's called spam; Monty Python has a sketch on that Just say "No spam" and you'll get a lot of it!
Honestly, I recall never advising someone to play a Wizard if they state they have a class preference. At most I might mention a class that's exactly the same fluff-wise with a slightly different set of abilities (e.g. Monk vs. Unarmed Swordsage).
If someone comes on the forums and asks how to maximize your X by level Y, well, the answer is usually a Wizard since that's the easiest (and sometimes the only) way. But honestly, how often is someone who asked for advice on how to build character X or class X told to play Wizard instead? 'cause I don't remember many instances of that happening.