Extrapolating out from a single, rushed release to all the upcoming competitors isn't going to tell you much.
Why not? All the various competitors have had a year of more to counter the iPad. So far we have one rushed release and a hot air balloon's worth of vapor.
Because to do so is to ignore the specifics.
Flash was missing from the Xoom at launch, Adobe will be putting out Flash for Honeycomb in 2 days (a beta already leaked out). The 4G upgrade will be in less then 90 days. Honeycomb was obviously not complete due to a few missing features (SD card support for instance), I wouldn't expect more then a month or two for those to be resolved. Same with general bug fixes, etc.
Most of the Android tablets will be coming out in June... at which point all of these issues will already be dealt with. Maybe there will be other issues, we don't know, but there's no reason to expect other tablets to be as rough as the Xoom which was obviously pushed out before it was ready to beat the iPad2 to market. So considering the specific issues and their reasons with the Xoom, why do you think it is representative of all non-Apple tablets?
I see plenty of 'will be' and 'in the future' when anyone talks about how Android on the tablet isn't a huge failure. The various vendors have been promising an iPad-caliber experience for more than a year now and have, so far, failed to deliver. Even if the Xoom had actually shipped with the features promised, the biggest failure of Android is the developer and application support that the iPad has garnered. iTunes and the App Store are un-matched in the Android world and I'm really not convinced of the utility of an Android-based tablet that can't provide the same app and media experience as iPad.