Yeah, the PS3 is definantly worth it. You get many built in features with the PS3 and there's lots of anticipated PS3 games coming out in the future, and Metal Gear Solid 4 is out on the PS3 and it's one of the PS3's biggest games of the year.
The PS3 is reliable as well just like the other guy stated. I've had for a year and a half with no problems at all.
Sony is constantly updating their Online service as well and the PS3 has evolved a lot since it was released.