I actually liked the whole MGS2 concept of playing the rookie who looks up to snake. But after playing MGS3 and seeing how they made fun of him... ouch. XD
I get a kick out of the faux-beginning they have when you pick "I like MGS2."

I especially like the out takes they made, and put up for download.

(SPOILER) Seeing 'Raiden' run over by the Metal Gear was hilarious. Funniest thing I'd seen in a while.

As for Brother liking Yuna... are they not first cousins? ...and he seems to like her in much-more-than-just-friendly kind of way. Maybe it is just the way I was brought up, but wanting your cousin is not generally encouraged.