Frame rate issues aren't really that big of a deal. I mean you can see them here too:
http://www.youtube.com/watch?v=TNtB5DoJ6OI
The problem is - unlike in the video quoted above - SE have yet to really show anything worth seeing or getting hyped up about (which last time i checked was the point of a trailer?). So there's basically no redeeming features on display to alleviate whatever misgivings people would have toward the technical aspects (like fps rate) of a game that's obviously still in alpha. There's nothing really to draw anyone to the game besides slightly downgraded Version 1.0 graphics.