If the way to be better than your competitors is to have more features than your competitors, then Symbian is the best mobile OS in the world. (... Of course in some ways it is.) But I also think recent competitors have shown that it is more about the quality of the features than the quantity of them. For instance, you can sell really a great deal of devices, even if it has a closed ecosystem, no MMS, no ASR etc. Do certain things a lot better than others rather than trying to match everything that is already available.
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...