Are you also actively advocating for...
All Operative DPS
AP & Shieldtech PT
31 point Immortal or Vengence Jugg
31 point Sniper builds in any tree
Sorc DPS, 31 point Sorc healing
The entire Mercenary AC
Any 31 point Assassin builds
Because all of the above are afflicted with just about as many (if not more) problems than any Marauder spec, including Annihilation.
PT has Pyro.
Juggy has hybrid tank and lolsmash
Assassin and Sniper have hybrid builds only
Sorc has bubble stun and hybrid heals (though you do sometimes see a puddler)
Op has healing
Mercenary has healing, which is subpar, and is a complete farce otherwise.
And we're complaining about Annihilation being "less good" because it the easiest Marauder spec to neutralize from a DPS perspective (provided that healer(s) are spamming cleanses like crazy) and it has so-so burst (like the majority of other DPS specs for other ACs)?
I mean, compared to ANY other AC except maybe Sin or Sniper (which is of limited utility in RWZ to begin with), Marauder is in a good place. Sure, Anni being more viable in Rated would be nifty, but that's not going to happen until BioWare reduces the focus on pure burst in PVP. The spec is WAY TOO STRONG otherwise to muck with, it just isn't suited to the current metagame.
Besides snipers, I agree that the specs you listed are weak for ranked.
Imo, watchman is overall:
All Operative DPS- better than scrapper/concealment, worse than df/lethality.
AP & Shieldtech PT- better than AP/tactics, about even with tank
31 point Immortal or Vengence Jugg- better than full tank, worse than full veng/vig
31 point Sniper builds in any tree- worse than all 3 full sniper specs
Sorc DPS, 31 point Sorc healing- better than full TK/lightning, worse than puddle heals, full balance/madness, and TK/lightning-balance/madness hybrid (bubble DPS).
The entire Mercenary AC- better than gunnery arsenal, about even with assault/pyro, worse than heals.
Any 31 point Assassin builds- worse than full tank, better than full infil/deception and balance/madness. They do have viable tank/middle tree, tank/shared tree, and middle tree/shared tree specs though/
I'll admit that sniper is the AC I know the least about, but good gunslingers I've talked to say they usually run full 31 specs, both MM/SS, sabo/eng, and df/lethality. I know there are some viable hybrids though.
I'm not saying anni needs fixing now or that it should take priority over fixing commandos and such. And I agree that it would be hard to make it viable in competitive play without making big changes or making it OP.