For me Android's multitasking is good enough and also maybe better than "real one" because the many non expert users. Android's one cause of success is that it also try to be a OS for a "common people".

More it bothers me, that there is no POSIX-environment in Android if someone wants to port desktop-Linux-applications to Android. It is not so easy as it was for Maemo. (There is a possibility to install Fedora or Ubuntu on Android though, but it is not the same thing as the applications at least currently do not run as natively as Android-apps.)

Therefore I really hope, there will be a Tizen+Android hybrid, which will have both.

And I do think Android applications are as fast and good as Qt-applications. Qt itself is rather heavy and Java/Dalvik VMs are getting better and better runtime optimizations when there will be more RAM-memory in mobile devices.

http://dl.acm.org/citation.cfm?id=345105.352548