For hardcore players of MW2, I don't see the price being outrageous. But as a "casual" player (I still have levelled all the way through first prestige and play once a week or so) I'd likely have bought them for $10. I just hope they aren't setting a new price point for future map packs, like for Reach. However, as a heavy Halo player, I have no issue whatsoever paying $10 for three maps, whether new or remade, so the $15 for 5 doesn't bother me too much - again, IF MW2 is "your game".
The nice thing about large sales of the maps makes their integration into playlists more assured. In H3, you still rarely get some of the DLC maps in the non-required hoppers, even when they CAN appear when all parties own them. The maps are a better deal when you get to use them more often in general play.
Can't comment on the quality of the maps as a I haven't played them.
Can't we all just get along and play our games in peace?
