What sucks about it? Promotional/cash shop mounts have more effort put into them in game mounts. This isn't a controversial statement it's simple fact. From texture, animation ,and spell effects it takes normal mounts one to two expansions to catch up.
Hell the 9.1 glory of the raider mount is just a reskinned cashshop mount from wod even has the same animations and that is roughly on schedule.
- - - Updated - - -
I agree though I believe the resources spent on ingame mounts are intentionally left lagging behind the store mounts to make them more appealing to buyers.