Yes, it is a very good game if you like this kind of Mortal Kombat in 3D (MK Deadly Alliance, Deception and Armaggeddon) : it's fast, backgrounds and musics are superb, the A.I. is fair (and not weird like MK2 or MK3) and... There is two fatalities for each character (plus an Hara-Kiri), quite easy to perform, and bloody as hell !
MK Unchained also come with tons of vids and concept picts !
I've bought it not so long ago on US PSN Store for my European PSP GO, it's only 19 dollars...
Suggestion : try to find a 100% savedata on the net, so you'll be able to choose the second outifit of each characters, without playing the annoying MK Konquest RPG-like game (i only like MK for it is a FIGHTING game... but it's my opinion

)
PS : i got one US and one EU 100% savedata, just tell if you're interested...