Sometimes fun, sometimes frustrating.
Beautiful and maddening at the same time, Forza Motorsport will alternately reward you with a sense of accomplishment and punish you with a sense of futility which you will never be completely able to predict, thus deepening the overall frustration when it happens. When things are going well, they go really well...but the game can be a harsh and unforgiving mistress when the slightest mistake going into a turn throws you from first to last and the AI cheats relentlessly able to take ugly turns without having to slow down or worry about loss of control and totally unaffected by the same laws of physics to which you must adhere if you don't want to find yourself crashing into walls and rails
As was the case with my ex, Forza Motorsport has some considerable appeal both at the superficial level and in terms of the overall complexity and depth of the game, but as was also the case with my ex, Forza also requires a certain degree of masochism to truly appreciate, unless you really like sitting there wondering "OK, now...What the hell just happened?"