Not entirely true...
"It also means handsets locked down, with the network operator having compete control over what capabilities they allow their customers to have. Even installing a ring tone or changing a background graphic may require operator approval, which can frustrate users."
There isn't anything about BREW which stops users from installing their own ringtones or background graphics - this is a choice that the operator makes when they roll BREW out to their users. Don't mix up what operators (particularly certain US operators starting with 'V') decide to do with their handsets with what BREW requires!
BREW does provide facilities to change ringtones or background graphics programattically, however, and there are many BREW applications out there which allow just that.
Probably the most significant shortcoming of BREW compared with Series 60 / Windows Mobile / MIDP is that because of the strong developer identification requirements there isn't a way of getting "free" or "hobbyist" applications onto the handset at the moment. Which is a shame.