everyone's different, but i agree with w+a. i tend to find all but the very best cali cabs pretty boring and monotonous.
i find more complexity, diversity, and creativity in the US Rhone-Style wines, and for cab, Bordeaux offers more complexity and diversity as well. I can honestly say though that 3 years ago I would've scoffed at those remarks, and i know plenty of people who have had their share of wine and still hold cali cab above all else.
even with my limited experience though, i can see how this is a very cyclical hobby, and what may bore you right now, may very well blow you hair back a year from now.
don't stress it though, you could have far worse problems