Which wouldn't be so bad, if Raiden wasn't the complete opposite of good ol' badass Solid Snake. Raiden was sulky, unlikeable, and stupid-looking -- it was like if you got 15 minutes into Escape From New York and the director suddenly switched out Kurt Russell for Corey Feldman. And gamers weren't caught by surprise here just because they weren't paying attention: Kojima went out of his way to hide Raiden's existence. Preview footage even inserted Snake into sequences that, in the game, were actually played by Raiden.
If you have time to read essays on what video games are really about (congratulations, newly unemployed person and/or Cracked employee!), you'll learn that Kojima was making a statement about information control and the Internet. Specifically, he wanted to point out how easy it is to manipulate the willing by controlling the information they can access -- Raiden is manipulated by the villains of the game in the same way that fans were manipulated into thinking they were going to play a game they liked.
Now you know. And knowing is half the boredom.
There's much, much more to the whole thing, but to explain it all we'd need a 15-part analysis, a better grounding in postmodernism than Internet comedy has given us, and several bottles of grain alcohol. Long story short: Most fans missed the meta-commentary and were simply infuriated by the bait-and-switch, along with the confusing, fourth-wall breaking, and generally bonkers plot. Our hats are off to you: Truly, Kojima, you were the greatest gaming troll ever ... until Eve Online came out.