The first big disapointment with the Roku was the lack of AirPlay support. Granted this is a licensed technology but all one has to do is look at Apples share of the market between iPads and Iphones (as well as mac's). It doesnt make any sense why Roku has not gone the extra mile to tap into this stream.
I'm pretty sure that Apple is currently only licensing the audio version of Airplay. The only 3rd party AirPlay video capable products out there have been enabled via 3rd party software that has reverse engineered the protocol (and encryption key), which, if I'm not mistaken, is against the TOU. AirPlay mirroring which you're more likely referring to, hasn't even been reverse engineered, yet. That aside, to site the that lack of AirPlay support as one of the main reasons you're dropping the Roku, when no competitor out there offers it aside from Apple TV, is a bit silly, IMO. To further turn around and complain about a lack of significant presence at CES, when the device you're clearly suggesting that you're switching to (again Apple TV) had absolutely no presence at all is just further silliness. If you want to switch to Apple TV, go for it, but if you're wanting to take parting shots at Roku for some reason, at least come up with constructive ones.
FWIW, I own an Apple TV, a WD TV Live, a Boxee Box, a Google TV, a HTPC, and numerous Rokus. The Rokus, WD, and HTPC get used more than any of the others, but there's no law that I'm aware of that prevents you from owning devices from more than one manufacturer.