I've played bits of II, III, and the GBA game, essentially all of VC, and all of SA, IV, IV's DLC, Chinatown Wars, and V. I've gotta go with 2 easily. The GBA game is effectively the same thing though so I guess it's a toss up.
As an aside, IV gets far too much flak nowadays. It wasn't a 98 overall game, for sure, but it's solid if you accept it for what it is. It does a great job of playing up the hopelessness or modern LC, and while the driving mechanics are somewhat weak, they're easy to get used to and the solid cover mechanics made up for it to me. My big issue is that this was a 2008 game without checkpoints. Chinatown Wars also gets flak because I guess it's 2D and therefore people think it's bad but that game is one of the best DS games I've ever played, hell, one of the best handheld games I've ever played.
You should check out my YouTube channel, The Golden Bolt! I review all types of video games, both classic and modern, and I also give short flyover reviews of the free games each month on PlayStation Plus to tell you if they're worth downloading. After all, the games may be free, but your time is valuable!
