well FA was based on the bug-fixed SupCom 1 engine so they updated FA only twice. Yeah, there still are quite a few minor bugs in FA especially with experimentals, nothing serious though... I've never had one of those memory holes that are allegedly slowing down the game to a crawl.
Play FA with one or more AI's on a large map like Setons. You'll get the bug with the sim speed dropping to a crawl, guaranteed, and it wasn't a problem in vanilla. Unfortunately, what with my being primarily a skirmish/coop gamer, it was a game breaker.
I attribute the increased effort being put into patching this sequel to their new publisher Square Enix, as opposed to THQ who published the original. FA came out less than a year after vanilla had hit shelves, and none of its patches were anywhere near as substantial as this one.
As for FA, well it's a bit unfortunate, but it was pretty much abandonware the moment it left the gate.