Your post has some false information and weird conclusions.
Zealot is self pump tactic.
WH has 2 drains.
Shaman pumps group with EWG which has somewhat long CD, AM st pumps with nonstop spam, and gets an ally to M4 within 25-30sec. (say a KOTB with Solar Flare)
Mara drains is way superior to other drains for sure, but Solar Flare hits for certain and drains enough to nullify enemy M4s. BW BH drains massive amount of morale as well.
The original game balance somewhat hinted at Destro having better morale pump potential and defensive options, and on the other hands Order having better M4 "finish them" morales.
On Order you can bring M4 cheese like IB Axeslam, Kotb Solar Flare, RP Rune of Skewering, BW Burning Head, WH Divine Blast. With various other amazing morale tools like SM WoH, old RP Mountain Spirit (was 20s), Kotb M3 rootbomb, and classic BW M2 drop.
Destro had amazing defensive morale gameplay, with DoK self pump and 30s effect on 1001, Chosen+BORK fast M4 or even Bellows rotations, Sorc WWS up very fast, BO 5s m3 silence.
Obviously if Destro brings their best mara drains + good dps players, Order will struggle to win. But they usually don't, instead opting for more luls setups or whatever was found online.
We have lost so far only once when playing as Order in city sieges, and that was vs LOB/Exodus/Montague allience, with us only having 10 TUP + 6 Phalanx + 8 randoms online in the city wb. Good AMs and good knights with Solar Flare get you pretty far in city fights.
The mara drain probably needs some tweaking at some point, but it's hard to say whats correct drain value, considering it can proc on all melee attacks. 225 drain when aoeing feels potent (especially with Wrecking Ball hitting 7s hits over 3s, meaning target might lose 7x225=1575 morale in 3s, meaning full M3 is basically down to 0), the only change I'd maybe recommend was putting it at lower proc rate or adjusting it to maybe 150 or 125/100, depends if the idea is to have 1 mara prevent enemy morales, or 2-3 maras to completely nullify enemy morale gameplay.
another thing I would consider is removing Sorc M2 (was only added last year), and then maybe changing BW M2 bomb to M3. (they have self pump)