If there is one thing that UT does better than every other FPS on the market, its support custom content. While a lot of people felt UT3 was a step down, it was a step in the right direction.
Sadly, I don't think consoles were ready for UT. UT had a HUGE fanbase on the PC, and not a lot of them were ready to make the jump over to console. So this is why you find the game for so cheap. But as soon as I heard UT3 was going to support custom content on the PS3, it was a must get for me, and I wasn't let down.
First off the bat, there are 2 free map packs available for this game, not to mention the limitless amount of mods and maps made by users.
So why do I say if you like the original UT you may like this game? Because a lot of people have made re-makes of a lot of the classic maps we all know and love. Facing Worlds, Thorns, LavaGiant, and November just to name a few. If you search the internet, they arn't hard to find and there is a ton of custom content. Probably the only way you'll see Bomberman, Mario, Sonic, Master Cheif and Solid Snake having a shoot out. Yup, eat your heart out LittleBigPlanet, UT3 had custom user made levels a year before your release!
Over all, this game gets a 5/5 for its ability for custom content! (Sorry 360 users, your version doesn't support custom content, and you can thank Microsoft for THAT!)