Declining Interest Rates in GTA 4

I bought GTA 4 on day 1 purely on the hype provided by various well respected video game journalists and the numerous A's and 10's that were giddily stamped onto Niko Bellic's slightly cro-magnon forehead. I recall phrases like 'Oscar worthy story' and 'what video games were always promised to be'. And while I'm not naming names (ahem Hillary Goldstein), I am starting to realize that this game is not as revolutionary, nor as great as I was led to believe. I started GTA 4 'on the train' as they say, my eyes and ears closed to any sort of imperfections, playing until the wee hours of the morning, sacrificing precious sleep to play out what was surely to be the greatest story ever constructed in an interactive environment. After completing what others have told me is the halfway mark (bank robbery), I have not even come close to finishing it and struggle to put down the Rock Band drum sticks in order to complete the next mission. Now, months have gone by and I still am waiting for the urge to re-enter Libery City. Is anyone else finding it difficult to regain the momentum necessary to finish GTA 4?