Use it...and help report bugs so you can help the community instead of mooching off of it.
IIRC, Adobe isn't open-source . . . so if I understand you correctly, this is a paid beta that you're mooching if you don't use?
So buying the upgrade only to sit on it and pout until it's "perfect" is dumb.
By the same logic of being a mooch for not reporting bugs . . . buying it and waiting until the major bugs are fixed, makes you an investor, no?
NOT using LR4 because of bugs only means it takes longer for other bugs to be found.
That's actually not how QA works, at all. That is how you skimp on QA to minimize release times and (try to) maximize profit. I have a *touch* of experience in software testing
A large number of users have indicated a 200 to 300% slow down when compared to LR3. It is found in many areas of work but most annoying when sliders respond very slowly or when importing work. There has been no recognition from Adobe this is something they are working on.
An internal 'power user' should have caught this. If they don't have anyone in management that uses the software intensively, it speaks volumes as to who is steering the ship.