Meh.

I'd debate whether Final Fantasy XII and Dragon Quarter are in different genres to their predecessors. They're all RPGs, and they're all pretty close together in the RPG subgenre rainbow.

Though I do see your point with something like Dirge of Cerberus, which I'll most likely never go near simply because I don't really like shooters.

And I can't deny that I was a bit disappointed when I heard that a followup to my beloved FFVII would be a genre I don't really like. ;__;
Fortunately after watching Advent Children, I wasn't inclined to especially care about any spinoff of FFVII anymore.
And I'm still not sure I like VP2. ;__; Though I did play it when my Japanese was kinda crappy, and stuff's never as fun when you're scurrying away through dictionaries every second sentence. So I'm thinking about giving it another go.
