A little bit of homework on the sibject could tell you that FO3 is a completely different game than it's predecessors.
If it was drastically different, like being an FPS instead of and RPG (and I didn't liek RPG's), I would easily know I wouldn't like it before buying.
"Well you -should- try something before you can shake your head and say that its strayed too far from its roots (mind you, it not being isometric isn't an issue - but this, heh, theme stretches to the other complaints). "
You can't tell that from watching two minutes of video? It's called doing your homework, not just blindly buying a game you may not like.
A lot of fans felt obligated to buy Fallout 3, it is Fallout
3 after all. How dare they buy it and complain about it not being
anything like its predecessors. I think Bethesda was too lazy and "conservative" as Cheng put it to try something different (ironic that a Bethesda developer would call Blizzard conservative). I liked Fallout 3 for what it was, but that doesn't mean I have to agree with everything like some blind sheep and sit on my hands lapping up everything Bethesda shoves down my throat.
As a Fallout game, there are certain expectations. You shouldn't
have to research Fallout 3 if you're a fan of the first two, it should have played like them since it's a
sequel and not a new series. I expect choices and consequences at the very least, as Ausir pointed out. Fallout 3 didn't even have that.