Are you going at them in chronological order for your first time? Because for the first time, release order is better, seriously, though it's cool if you haven't had anything confuse you yet due to some slight retcons and stuff done by later releases (which are set earlier in the timeline!) changing how earlier games (release-wise) are perceived. Ah well. And seriously, Big Boss has become a great character and I think that seeing how his character changes from the hero to the villain during MGSV will be extremely interesting (and seriously, MGSV is gonna be friggin' dark for the series, based on the trailers)
I personally just beat MGS2, which I was replaying, the ending is still... something. I will be starting MGS3 soon.
I'm also playing Persona 4 Arena on PS3 now, since I can't go online on my 360 and the PS3's pad is better for that kind of fighter (because of the dpad) anyway, so whatever. Played a couple ranked matches and won by spamming Narukami's Furious Action, was hilarious. Also destroyed a Teddie who kept jumping back and spamming items, no thought put into his "setups". Fun times, even though my connection was being bad so I stopped played. The game's still pretty active, considering how old it is and the time at which I was playing.