We actually like DL better than WDW. You really can't spend more than a few days at DL, even if you do go to DCA. We spent 5 days there a couple of years ago, and even the children were complaining "do we HAVE to go to DL AGAIN???" lol.
If you're able to rent a car and visit other areas of Southern California, then it would be a wonderful vacation! There is so much to see and do in So Cal! The beaches, San Diego, Hollywood, Rodeo Drive. We still like buying a map of the stars' homes from Sunset Blvd and drive through the hills. One year we actually saw Halley Berry (sp?) outside her gates. OK...I know that's such a touristy thing to do, but we enjoy it.
Southern California's weather is pretty much the same all year round. It does get a bit cooler in the winter, but nothing awful. You should probably go visit the DL DIS board and talk to the "locals" on specifics like weather and other places to visit (btw, Passporter is publishing a DL area book next month that should be good).
Some of our favorites at DL: Indiana Jones (the BEST Disney ride), IASW, Blue Bayou restaurant (located inside Pirates ride), Alice ride, Pinocchio ride, Casey Jr. train, Storybook ride, Snow White's grotto (it's really nothing to look at, but we've always loved it and it's the first thing we visit on all our trips).
Mary