I can completely relate with Yahtzee on the 2D-3D issue, it's one of the things that constantly bothers me.
Remember Worms? That lovely 2D cute-wiggly-creatures-shooting-the-shit-out-of-everyone game? That game rocked. It was pretty, the gameplay was fantastic but what was best about it the learning curve was non-existant. Get some friends over, fire up Worms 2:Armaggeddon and hillarity ensues in the space of 15 seconds.
Than Worms 3D comes along and it all goes to hell. You can't aim worth shit, the collision detection is all over the place, the timer keeps running out since you constantly fuck with the camera but what's the worse now you cannot find anyone who wants to play it with you. It's not a party game anymore, it's a shitty FPS pretending to be a Worms game. The series never recovered from the 3D fiasco, as far as I'm concerned.
Or let's take another example. There's a game that's been on my radar for a loong time yet I've never got time to actually play it - "The Suffering". I installed it and...WTF? This is considered...a GOOD game? Faces that seem made of two polygons tops, jerky movements, immersion factor zero? This game was actually PRAISED for its graphics? Of course, I was spoiler by Crysis, Bioshock and Batman:AA I had a chance to play in the meantime, so this award-winning game looked like utterly unplayable crap. And it's only 5 years old! Metal Slug is three times older and it looks great as ever!
It's true. 3D ages like crap, 2D preserveres.