That's the added value of the show for me, specifically him and his parents. The rest of the cast looks like this: Ashton Kutcher (fine, but a pretty broad character), Mila Kunis (same as Kutcher), Laura Prepon (also fine, but she's not as funny as the others), Wilmer Valderrama (no thanks, funny foreigner character was about 10 years expired even when the show came out) and Danny Masterson (never liked him or found him funny, pretty validated there).

So I'd say yeah, Topher and his parents are kind of the whole show, if we're being honest.