No. My wife's MB is fine. Cooler than my Dell D810, hotter but quieter than my Core Duo iMac (which is almost silent), no problems with construction.
There have been some problem machines, but it has been blown out of all proportion because those with problems are more vocal than those without.
But then I am a recent switcher whose Dell whines, is too hot to touch, too heavy to carry for long, too big to carry in my favourite laptop bag, and has backlight leakage along the bottom of the LCD. So I'm not as discerning as those who have only used Macs.
And you can always get it replaced if it has problems.