I finished all the races for Ridge Racer 7, including the pretty difficult Opus racers. Although I've not got 100% yet, I have about 96%. That's because I don't have 100% with all the manufacturers, so I'll probably end up unlocking a couple of manufacturer racers as I try and get 100 pts with all of those. Pretty tedious if you ask me.
I guess I still have the UFRA Special Event races, but the first one is kicking my ass! Never mind the other 24 I think. But yeah, I was pretty proud of my accomplishment there. The hardest was definitely the Crinale Duel, but I think that was because I was going about it the wrong way, and with a little help online, I found out one of the setups to beat him, and after more annoyance I finally beat him. The other racers weren't as bad after that. Just learning the best points to deploy Nitrous to keep it as high as possible all around the track. The second you're out of NOS, you're done for. I think a little bit of luck is needed to.