Jesus no.
Diminishing returns with every other melee stun. Trinket out, use the passive trinket, whatever. It's not a problem.
Because nearly every class doesn't have a way to suppress/remove slows? It's fine.
3 seconds of 100% movement speed, so OP no one uses Ret for carrying the flag.
Also it's on the GCD and doesn't remove/suppress slows.
And for complaining about Ret's "OP SLOW!", you seem to forget a lot of other classes have roots/slows. Yes, paladins have freedom, but then you can just stun and wait for freedom to run off, and repeat the slow.
One isn't usable in arenas, so this is really irrelevant. In a BG, you can nuke the paladin down fast enough that only bubble will save anything.
If they ever reach you.
Nothing you said at all.
Ret needs HELP if anything.
Removing steed from the GCD would be a lovely start.