Have you used a V2 Boxee box? Its honestly almost unusable and underpowered from both a software and hardware perspective, even the remote feels cheap. Their D-Link V1 box was a significantly better but they didn't make it, it cost twice as much as a Roku and was only a hundred bucks less then an Xbox which they couldn't compete with. So they tried to take on Roku on the low end and flubbed it badly.
The one thing boxee has always done better then anyone else is their XBMC overlay for playing back local (or network attached) media. This is also where Samsung lacks, if anything this should be where Boxee's talent can play a part.
The QWERTY remote was icing on the cake, to be honest.
Glad to see Samsung taking over; maybe now Netflix will work in the UK on it.
By far the two most frustrating aspects being the forced updates (which were often more buggy or broke features) and the lockups while in sleep. There was nothing more annoying than having to get up and hard reboot the thing every time I wanted to watch something.
Once the Pi and raspbmc became a viable alternative I quickly replaced my boxee boxes because, while not bug free by any means, they're much closer to "just working" than the boxee box ever was.
The one good thing I can say about the boxee box, though, is that its remote was a real treat. That thing worked like a charm.
As a bonus, XBMC interfaces with your TV's remote over hdmi, so you won't even need an extra remote, very wife / gf friendly.
Samsung doesn't need help building hardware. They need help building software. I suspect that's why they bought Boxee.
For example, parental controls should be available through your phone. You should be able to see what your kid is watching and also force them to watch something else "remotely", even if you're on vacation. or maybe they are staying up too late and you turn the TV off for them.
There are many other ideas but that sounds like one of the more useful ones as opposed to being more gimmicky (like gesture commands).
Their TVs seem to be getting better at least. Some previous Samsung TV's I've owned have been atrocious in the UI department.