I'm on the HP 2010 bandwagon. It injected new life into the series once, so it can do it again.
HP 2010 is definitely my favorite entry in the series. They just hit every note with it. This has really always been my favorite clip that shows what was so good about that game
The drifting in that game was out of this world. And I think that clip shows that Criterion knew just how good it was. You don't make a long loop like that's intended to be drifted around if doing something like that isn't fun with the physics you've created. I also loved the it didn't take place in a city, and instead largely took place around a countryside. You ended up with something almost like that Sega blue sky look. The music selection was also great (aside from that 30 Seconds from Mars song that starts every time you start the game). I think it's one of the top five arcade racers ever.