Summary: Too expensive. Firstly you have a subscription which isn't too bad at first, only $15 for 3 months. However after your sub is up you better be prepared double that because making a new account will just mean starting all over again.
Summary: Simply no comparison, by far the closest to racing that you can get, only limitations will be yourself and your equipment. Remember this isn't your console controller based racing sim. Be warned, this is a racing environment that is taken very seriously.
Summary: i Racing claims quite a lot. Some claim that graphics is not up the level of what is a standard these days, however there are much more serious issues with the simmulator. Graphics: Highly sufficient for the purpose, no need for improvement, however competition will force natural improvements over...
Summary: Excellent sim -- simply the best out there. The amount of work that has gone into making iRacing a realistic experience is truly astounding. I've been a racing sim devotee for 20 years and iRacing is top of the pile.
Summary: One of the best sim racing games out there, hands down the best race organization so you'll always have something to race any time you log in, however it comes at a price, in my opinion too high, I would even call it price gouging.
Summary: Absolutely, 100%, hands-down the single best simulation racing title that has ever existed. It is extremely challenging to adapt to, especially if you are new to sim racing. But the robust online community allows adapting to the game seamless.
Summary: This sim is quite expensive, so you should focus on one class rather than buying all cars - well if you have the money why not, sometimes you really have to try everything ! And this sim is so close to perfection, you really want to try each car and track.
Summary: iRacing claims to be the best racing sim out there. It surely has plenty of tracks and cars. However, there are many things about iRacing that are not so great. The game is setup with a subscription service. Already it's annoying because it does not fit the subscription based game format.
Summary: By far, the best racing simulator I've ever "played". Not only the physics, car response and tracks are brilliantly simulated, but everything that involves competition (points system, race splitting, safety rating...) really works, and make you feel close to real live racing.