Recommendation: All the games aren't RPGs. Just play through them all.
I already got through MGS1 and half of MGS2 before I decided to take a hiatus for GTAIV. Then, back to MGS for me.
I'm glad there's some MGS love in this thread. Seriously. My MGS love isn't a Sony thing, it's an appreciate for a franchise that started breaking ground in the eighties and still manages to do so with every installment. Even the dialogue and voice acting gets a bad rap when it shouldn't. Compared to other games in every period they've been released, MGS as a series has surpassed anything at the time that could be compared to it.
Proof of the last comment:
MGS came out during a time when dialogue centered around "Jill Sandwich" and similar lines in games. I mean, listen to the voice acting in another big Konami release for the PS1 in Castlevania: Symphony of the Night. Sorry, don't tell me that MGS the original had horrible voice acting and storytelling whenever we had THAT in games at the time.
FFX didn't really hold anything in terms of voice acting to MGS2, even with whiny Raiden (The Tidus laugh is fucking horrible)
MGS3 was less complicated than its predecessors in terms of story complication, and I found the story more compelling and satisfying than the other games out at the time (San Andreas, Halo 2) although GTA:SA probably had better voice work overall.
I don't share the hatred of the Boss, but I can agree that the Boss was probably one the weakest antagonist overall in the series.