90210 bid farewell to 2010 this week by turning two of its main characters into cheaters.

Granted, there were extenuating circumstances - Adrianna has become a cartoon-like diva and Charlie (I think that's his name, right?) has received about six seconds of air time with Annie - but that doesn't change the bottom line.

On "Holiday Madness," I found it very difficult to be anything but disgusted by Annie and Navid's actions.

The latter has a much more compelling case for his infidelity, as the show has actually dedicated time to his burgeoning relationship with Silver. It's also made Adrianna into such a caricature that she's impossible to take seriously as a human being, let alone a loving girlfriend.

Still, N Dawg: Man up. Dump Adrianna. And then get your Silver on.

Everything between Annie and Liam, however, just proved what had been clear all along: Charlie was nothing but a prop, a random guy inserted into a few episodes just to delay the inevitable reconciliation between these two.

When Liam said to Annie "It's hard for me to see you with him because I'm in love with you," I laughed out loud. Who is Liam kidding?!? No one has actually really seen Charlie with Annie since that character was introduced.

Elsewhere, I've already voiced my displeasure over the way the show took what could have been an interesting, realistic portrayal of a student-turned-singer and made it into an over-the-top, cliched mess (a Paris Hilton-like puppy? Really?!? That's sitcom material, but we're meant to be taking this transformation seriously, as it's leading to the break-up of the show's core couple.). But I also need to simply comment on how little sense anything Adrianna-related makes.

Wouldn't Victor and Adrianna have a contract? Like any manager and client? You can't just cut someone's commission on a whim. Sigh.

As for Ivy and Laurel, sure, I'm happy they're on good terms again. But the storyline with her father would have had more resonance if we saw the guy for more than two scenes.

I'm really searching for something positive to say about "Holiday Madness" and I guess there's this: Teddy may not have been ready to tell the world, but he did say the words to Ian: I'm gay. That's a major step.

Other than that, please readers, clue me in if you were truly invested in this week's developments. Is the return of Mr. Cannon the sort of cliffhanger you were hoping for? Or did you see it coming? After all, when he simply left a few weeks ago, did anyone believe he'd never come back?

This feels more like dragging a storyline out for as long as possible - by literally ignoring it for weeks - rather than creating an interesting, layered plot that can actually fill an entire season.

In I hate ending the year on such a negative note, but blame the writers. In closing, I might as well go all out in my criticism and ask: what the heck was that bathing suit Silver was wearing in the hot tub?!? Yech.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.