I think RT makes sense. Yeah the ecosystem is not there yet. But for a lot of home users, all they need is a tablet for net surfing, media, games and a computer for running Word/Excel. This gives them both. I don't think MS is going to give up on the RT, so I am sure that the userbase will come, leading to a flood of apps and better app quality.
As for the laggy apps the reviews talk about, it was the same way when I got my HTC Evo. The Android app selection sucked at the time and many of the apps out there were not coded very well (Crashing all of the time, or freezing my phone) over the last two years the app selection has become robust and most of the popular apps do not seem to have many bugs. This will be the same for RT, IMHO.
Windows Surface RT is not a device for me... I have a first gen iPad that I loved for six months, and it has gathered dust for the last few years. But many people love and use the iPad and other tablets on a daily basis. I do plan on getting a full Windows 8 laptop convertible sometime next year though, since my current laptop is getting close to giving up the ghost. I'm hoping in six months or so the prices start dropping on the convertible laptops.
