Want to buy a MBPR but afraid, have some questions

So i'm a windows user, whose been wanting to move to Mac for awhile now, and i want to get a MBPR but I've heard a couple of disheartening things about it and wanted to see if anybody here is having any of these problems.

1. Bad battery life (about 3-4 hrs) since ML update

2. Image retention on display (burn-in)

3. Constant system freezes

4. Strange creaking sounds (bad build quality)