Well since you mention shooters and racing games Gran Turismo 5, Killzone 2/3, Wipeout (Fury) spring to mind, but then you have other exclusives like Infamous 1/2, Heavy Rain, Uncharted 1/2, Mag, God of War 3, Resistance 1-3, Metal Gear Solid 4 and many more, there are also quite a few great psn titles that are fantastic fun, pretty sure Fat Princess is still ps3 only? I couldn't get enough of that game.
Honestly in my opinion; owning both consoles (plus a Wii and gaming pc) the ps3 is fantastic for exclusive titles, it kinda gets screwed on multi platform games, either with Microsoft demanding timed exclusives or crappy ports since the games were originally developed using the 360 (although the latter is alot less of an issue these days)
I barely use my 360 these days, and If I could magically transfer all my multi platform games I own on my 360 into ps3 versions I would without a second thought (I owned a 360 since release ps3 about 1.5 years after launch due to money etc).
Edit: Oh, but wether it is worth the purchase or not depends entirely on how many exclusive titles you actually end up buying/playing, on the bright side its a decent Blu Ray player and the online play is free so there is always that. Basically only you will be able to decide if is worth the purchase or not.