So don't let anybody tell you any different.  Here are my reasons:

1.  Attention to detail:  See a poster and there was a comment about it.  See a bottle of champagne?  Shoot it.  It would spill on the floor.  See a bug?  Squish it.  See an ice cube?  If you waited long enough, it would melt right before your eyes.  There's a cable hanging from a crane 100 feet in the air.  You've never even noticed that it was there.  Go ahead.  Shoot it.  It will react to the bullets!  Somebody took the time to add this obscure element!  Even the little tranquilizers that you shot from your gun had writing on them if you zoomed in with your binoculars.

2. Diversity:  In the span of a few hours, you were sniping plastic explosives, photographing Metal Gear Rex, listening to conversations with a microphone, swimming, escorting a woman around, putting out fires with liquid coolant, looking for explosives, etc.  No other MGS game offered this much diversity.

3.  Raiden:  You can ridicule the guy all you want but a.) He had a girlfriend.  b.) He kicked ass.  The guy took on 421 Metal Gear Rex at one time.  And by playing as Raiden, you got to see just how awesome Snake really was from a bystander's point of view.  Plus, Raiden had a nice butt.

4.  It was pretty:  This game came out in 2001.  If it was released today for the Wii, it would still be amazing.  The explosions, the water effects, the character models.  Nothing anybody was showing in 2001 came close.  Kojima and co. were  years ahead of the competition.

5.  The Story:  At the time, it was pretty absurd.  The Patriots died about 100 years ago?  WTF was Hideo smoking?  After finishing MGS3, everything became clear. 

6.  Easter Eggs:  There's a guy who pees off of the balcony that you're sneaking under.  There's a comment for that.  There are posters from FHM.  You can kiss them.  Snake even whacks off!  During the Sniper Section, equip the microphone and snoop around.  You'll be surprised what you find.  See a bird, shoot it. This is just scratching the surface.  Long story short, the more you look, the more you'll find.  

  So next time somebody tells you that MGS2 sucked, kick 'em in the balls.  That'll learn 'em.

I read it and I thougt it was stupid.

That guy is just over-philosophizing and pointing out the 'significance' of everything in MGS2. I can also babble on about why exactly I decided to position my couch at a specific distance and angle from my LCD, but the point is if it doesn't sit comfortably then all the philosophy is useless. MGS2 had a lot of finer points to the story but Kojima ruined it with - oh wait lets quote:

Rainbird said:

And you can say whatever you want, but someone being possessed by a hand, a guy running on water and an entire terrorist takeover turinng out to be nothing but a training mission are just some of the things that made me go "Well this is fucking stupid".

There. It was fucking stupid.

The whole series if "fucking stupid" if you get right down to it. 

MGS1:  Raven can control ravens, Ocelot can control bullets, etc.

MGS3:  It rained blood.  A guy got carried off by bees.  Volgin has lightning in his hands

MGS4:  Raiden got both of his arms cut off and was able to wear a trenchcoat! 

At the end of the day, the MGS series is pretty much comic book science/logic in video game form.  And personally, I know what makes a good comid AND I know what makes a good game.  Did you read the whole article?  It was a hell of a lot more than just a guy over-philosophizing.  There were some truly great parallels that I didn't pick up on until I read that.  I felt like the guy was being an elitist prick (don't you just HATE guys like that, Dr. Grass?) who thought his personal opinion was so important.  In the end, I understood what he was trying to present.  I was impressed by it.

It seems that you've matured to the point where you can't enjoy a little escapist entertainment.  I pity you.