In my experience (with many machines, including many PC laptops), yes it is. That's why they're not allowed to be called laptops any more. They're 'notebooks', because you can't use them on your lap!
Most laptops get very hot. But at least my Mac laptop won't get hot enough to burn while just browsing the internet, like some Dells and HPs I've seen. When I see my computer get to 80c (or 90c in Windows), it's not fun, but normal if I'm going to push it so hard.
(By the way, fact about the MacBook Pros - if the metal is burning you, it's because the computer is cooling itself. My MBP feels hottest (especially near the screen, where the fans are) when the fans are high and the temperature is stabilising. That's because the heat is coming OUT. Good thing. Get a stat monitor and check yourself if you don't believe me. When the metal isn't hot, and I think the computer should be, it's usually because the fans haven't kicked in yet, and the CPU is getting hot! Then the fans come on, CPU temp goes down, body gets hot. I'd rather the heat came out than stayed in.)