I have bought the 4G Galaxy Tab 10.1 and I love it. So far I don't have issue except the apps. Yes, there are not many apps available for the tablet. And I have found that the apps for phones do not work well on the tablets and I occasionally got "force close" error.
With that being said, I don't need a lot of app in the first place. I use my Tab for email (it is great for Gmail), Google Calendar, Google Docs, TweetDeck, Google+, FourSquare, Picasa and some news apps. All these are working great, so I have no complain.
I don't use my Tab for games or movies (for the most part). If I want to play game, I rather use my XBox 360. If I want to watch a movie at home, I rather run it on my laptop and hook up to my big screen HD TV (when it comes to movie, size does matter

). Now, if I am travelling, I will rip some movie DVD and upload to my Tab which has 32GB storage space and then watch it.
So personally, the small number of apps is not a deal-breaker to me. And I believe the number should increase in the next 6 months or so.