I'm sure there will be a few issues for early adopters but overall Windows 7 has been getting excellent reviews and has been well tested leading up to the RTM build. I just switched 2 days ago and so far, everything is smooth.
By that same logic you should pull a perfectly good motor out of your car every 3 years because the manufacturer says so. Then you're happy because the new motor has only 7 problems, whereas the first motor had zero.
Gotta love the Kool-Aid drinkers.