Yeah I've been playing alot with the 80s Lotus, it's a proper blast though I do have to manually change gear at times in order to get it into the right gear
I am still ironing out my driving settings but a couple cars I highly suggest trying out are the ferrari 458 italia stage 3, lotus evora gx, and the pagani zonda r. The lotus evora gx is a lot of run, its super balanced and predictable I just love it, its maybe a bit too soft but I find it to be a lot of fun. They just added the mercedes sls amg but my initial opinions aren't great, the brakes are lacking imo.
The most insane car in the game is the lotus 98t though, oh...my...god. I swear that is so crazy when you are on the boost, pro tip, be sure to hit 9 or 0 on your number row, the car is set to 30% boost out the gate, and you can fine tune how much boost you give it by pressing 1-9 or 0, I can't remember which is 100% boost.
Also, download the nordschleife, its worth it.