MGS2 is the worst and most boring Metal Gear ever... any fan can confirm that.
Raiden sucks... give me Snake again.
And yeah... your argument is invalid at start because you think the Rising is a Metal Gear game lol.
1º: Opinion. Though you can ask fans of the saga; you'll realize that you are wrong.
2º Raiden doesn't suck. But this is opinion, so okay. I'll respect yours. Oddly though, your second statement. Because as far as I know, Big Boss is not Snake, not the Snake of MG, MG2, MGS1,2 and 4. So it is another character, and he's also a son of a bitch, considering you have played MG and MG2.
3º: Em...yeah, it has to do with Metal Gear universe, you know. It is not only because it has "Metal Gear" in the name.