Its a great tactical FPS but its not for everyone. It can be very slow at times and its fairly complex i.e its not like your average FPS game like Call of Duty, Battlefield, Counter Strike but for me, evan though I love those other games too, it makes Red Orchestra 2 very fun and rewarding when you get the hang of it.
If you have an interest in WW2 especially the Eastern Front and enjoy tactical FPS then you should definitely check it out.
There are a few bugs here and there, but there only very minor and are not game breaking at all and the game gets patched regularly.
Unfortunately I never played the 1st Red Orchestra Rob so I can't tell you whats changed.