To be honest, my personal view after 10 hours of playing the czech version, with sickboys patch to english:
ArmA does not fullfill its potential in its present state, and feels like a beta version.
The biggest problems are:
AI is not convincing at all.
Flight model is not convincing at all.
Sound seems flawed, especially sound from tanks or helicopters.
SP campaign scripting if very buggy.
No linux dedicated server??
The game engine is very power hungry.
ArmA clearly has the potential to depict modern battle in a way that no other game has dared to try, but Bohemia will probably need 4-5 months at least to iron out the most important flaws.
I just hope that this will not hurt Bohemia financially, so that it hinders further development of ArmA and Game2. I will follow patching closely, I refuse 100% to give up on ArmA yet! There is gold inside the ugly rock, one just need to refine it and get it out in the open!