I've been a fan for almost all of my life. I've actually been attempting to Platinum all of the games, as I purchased The Legacy Collection a couple weeks ago despite already owning The HD Collection and all the regions of MGS4 standalone.
I actually haven't played Peace Walker or Portable Ops, but I've played all of the other games countless times, not to mention Metal Gear Online (I really miss it).
I platinumed Metal Gear Solid 3 last week on two playthroughs. I got everything except the no-kill trophy on the first run. As of right now, I'm doing the VR Missions on MGS2. I'm 94.1% with all of them and like I posted on another site, I'd rather play Russian Roulette with myself than doing the MGS1 Snake missions, ugh. Once that's done, I have to get the Dog Tags from Plant on Easy, Normal, Hard, and Extreme, beat all of the Snake Tales, and beat the game without any alerts and the Platinum is mine!
MGS2 used to be my favorite game, but I've played it so much now that I don't care for it as much anymore. MGS3 is probably my favorite, as it's the most solid (no pun intended) and has a vast area for exploration.