I did. Its far from perfect but I had some very good time making it tru the storyline. And the real problem is that there is no multiplayer.
Actually Ascaron are making good games but... well these days the multiplayer is vital part of every game... how could they not realize it
Still if you didn't try it it's worth doing it . The bad part is that after you finish the storyline there is not much to do. Except doing it again with different upgrade schema maybe.
Ah yes some ppl get stuck on the 2nd flak mission. Funny I never had problems on it .