Not hating but felt I should clarify this "I'm not sure why the weight lifters I know bash on it.".

The reason there is some "hate" against crossfit is the general elitist attitude that crossfit people bring. Add that in with the fact since it's only a 2 day course to get certified to open a CF gym, it allows for A LOT of misinformation/form. There are a lot of specialized motions that should not be done in jerky/swinging motions.

I agree that being active with anything is WAY better than sitting on the couch hating on others. It really comes down to what you want to do and what you enjoy. Bodybuilding isn't crossfit and crossfit isn't bodybuilding.

Way to get active and help yourself though. Like others said, make sure you have quality instructors and you'll be fine.