FE11 was the same all along.
Chapter 5: You have 8 units, 5 more powerful come at you. Can you group them up?
Chapter 15: You have 12 units, 7 more powerful come at you. Can you group them up and kill them?
(Just a half-arsed example).
FE7 does have a slightly more likeable cast (although it's close) and better dialogue (FE10 lacks supports). I don't really agree on the endgame being better in FE7.
FE10 is longer, harder, contains more diverse maps, has a few improved mechanics (like horses moving after attack), and a larger group of characters (opens for replays). Oh, and no arenas.
I'm probably missing a bit on both, but overall, I like FE10 a bit better.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS
