Halo Anniversary is not HD, it is rendered at below 720p which means it's less than "half HD" in standards (It is rendered at 648p).
And I strongly disagree, FF7 is worth £10 to me even with the original content. £15 would be pushing it, but £10 seems priced right for what I get out of the game.
I complain about SE's pricing of their mobile games, they are overpriced for the experience received from the game.
Oh and in response to you saying it's not supporting the modders, the rendering driver behind the Steam version is based on the mod community custom rendering driver, the creator was paid fully for the use of his custom driver so in fact, buying the PC re-release version supports the mod community much more than any other release.
I don't use the widescreen because it looks bad, so I can't really comment on that, the game was never made for widescreen and looks rather bad stretched.