If you don't mind the exclusion of the career mode and the implementation of the random car manufacturer per 2 day in game time, then you will love this game.
Personally those aspects don't affect me at all, GTPSP has been designed to be a portable GT experience, a career mode like old GT games would only ruin it, since it depended on long races that could drag for over 20 minutes in some cases. Who seriously does 20 minute races on a portable console?. Also the random manufectures makes you to really calculate your money for those cars that you want.
Other than this, GT PSP has the driving physics of GT5:P plus it has super graphics for a portable game, almost on par with GT4 ;)
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
