Originally Posted by txa1265 
Glass isn't indestructible.
Gorilla Glass is!!!

JK
I get what you're saying though, you're right about Samsung phones in general feeling cheap.
As for the SII, sure, it's not as solidly built as other phones but I think it's a great balancing act: it uses what may be "lesser" materials, but those materials do the job fine. It's not like they're fragile and start coming apart if you hold them too tightly. And as mentioned, it keeps the phones light. I don't want to feel like I'm holding a brick in my pocket.
Phones shouldn't be made like they're going to last a decade though - who keeps a phone longer than 2 or 3 years?