Yes, that's not a typo. I got GTA4 for Christmas, along with GTA5, but wanted to play through 4 first. Loved it, all the way through, and I even like the physics that is often a point of criticism. I guess my major point of criticism is in its length. It's a bit too long, or maybe it's just because it's not set in different environments like SA was, making it feel longer. But I didn't feel it was much of a difficult game. Sure, there were some frustrating moments, but overall I felt they were manageable. I actually felt some of the tougher missions were the side-missions like the assassinations.
I actually got the Complete Edition, so currently making my way through The Lost and Damned, which is quite fun. Love the racing in it, which harkens back to Road Rash, and the theme itself as a motorcycle club helps differentiating it from the rest of the games in general. I've actually just completed Diamonds in the Rough, which I felt was one of the hardest missions yet, though I had a glitch which helped me complete it easier. At one point you're supposed to kill off some bodyguards on the way to deposit packages in trash bins, and normally there'll be more bodyguards on the way to the second bin. On this one try, I had died right after killing the last bodyguard, so when it came to replaying that part of the mission, it had actually saved progress so all I had to do was drive up to the trash bin markers and there were no bodyguards waiting. Bug or feature, it was handy!