tv commercials

[curious]

there are all kind of commercials on TV about different wines, some of which I don't see listed here.
How good are they, does the name matter? I know (I think) that it is the grape that is the name, Chards, Zins, P. Noir, but how much does that brand name play a part in the wine being a good choice?
I have seen lots of names mentioned here, that I have no idea of what they are.