Having seen the entire series of Beverly Hills 90210, I'd have to say that this is where the series starts to waver, making my interest less so compared to the previous seasons. Very early on, in fact by the fifth episode Brandon makes his departure, which is quickly followed by Valerie all of two episodes later.
It really is the parting of these two characters that lets the series down. Although we did get the return of Dylan McKay all of five minutes after Valerie's exit, this is the only redeeming feature. After this we get oddly rehashed storylines, but with clones of Brandon (Matt) and Valerie (Gina).