Just one week ago i bought ps3 and gta4 and within 7 days i was able to complete the game quickly! somewhere on the internet i read that it just takes 30hrs to complete GTA4 storyline.

Compared to san andreas its storyline way too short and i am pretty disappointed about it. I was expecting more like aircraft missions, fighter planes and more.. Just nothing there except a limited helicopter ride!
i expected lots of gameplay time from gta4 along and more missions. Once the storyline ended i lost interest in the side missions.
whats more disappointing is there are no planes to fly.
did you see the map of GTA4. It is only half to that of San Andreas. The missions are also less