I bought a PS3 years after it was released, partly just to play MGS4 since I was a big fan of the OG and the 3rd game.
Couldn't have been more disappointed, personally. It has a few highlights, but overall I found the story just felt really off, even for a Kojima game. It was particularly boring, convoluted, and unsatisfying. Honestly wished I had just watched it on youtube instead.
Other than that, I kinda struggled to find other PS3 exclusives that peaked my interest. The Ratchet & Clank games it had are pretty good. Motorstorm is a great racer, but other than that... At least for my interests, the rest of the library is pretty underwhelming. Ended up selling it without regrets.