Lots of neat little touches with this release, skipped 2014 but I own 2010/11/12/13 on PC. This is definitely the easiest to get into, I dunno whether the cars are just easier to handle now or whether its something they've done to assist gamepad users but it was actually really easy to jump into where previous versions had a lot of over or understeer depending on which year you played. I also found I could completely turn off Traction Control without much of problem, in some of the previous titles with a gamepad you had to run Low TC at least or you could find yourself spinning a lot.
The game looks kind of bland in some places, you can see there is an overall improvement and the car models look great with the heat haze out the back etc, but I did Singapore in Stormy weather for a quick race, games seriously look next gen there. Utterly amazing.
Love the torque of the new motors, getting caught up a gear isn't much of an issue, the cars pull hard, where in the past you had to be ringing their neck it is less of an issue with these cars. I do find I have to adjust to the 8 speed though and knocking down through more gears, I also usually do it too fast and compression lock the rears.
The only thing this game needs is the old Career mode, I jumped straight into Lewis seat as he's my favourite driver, but really I think you should have had to have started at lower teams and worked your way up through contracts like previous games.
Overall though, a solid title imo. No it's not super hardcore but I think it does enough to please a larger audience of fans; not too hardcore for casual fans and not too easy for the hardcores.