We're in the same data center yet I think your matches go very differently than mine do. I've seen cover used effectively both offensively and defensively just fine.
I've also seen Warrior burst shut down by many players with purify leaving a warrior bound and losing out on CD's. I myself have saved healers or even healed myself (using second wind and recouperate) from Warriors burst just fine. I've also seen Paladins effectively using their toolkit to harass and stun multiple players making full use of Shield Bash and amazing use of full swing,spirits, clemency, Hallowed, and veil.
That's the thing about Solo queue. A good player on a good job can kind of carry a bad team, unless the healer is bad or the opponents are better. Solo queue is 100% RNG.
If I were to comment on AST in relative to WHM specifically in solo queue, Nocturnal AST is less reliable in solo queue than WHM. AST can't handle spread damage across the team and keep themselves alive at the same time if the DPS and tanks actually know a little bit of what they're doing.
And if we were talking about solo queue then there's two extremes that need to be addressed.
There are extremely good players, and extremely bad players.
Extremely good players are what this list would follow, Extremely bad players are snowballed by sleep, low levels of burst,any kind of CC, I had a Scholar that only used Physik to heal, I actually restored more health over the match time than they did on my Monk. Then I've had good players who are capable of planning a coordinated burst in the pre match time frame and the match ends very quickly.
You honestly can not really rate Solo queue. That's why I chose instead to rate the jobs generally.
What would you rather have? A Warrior that doesn't know what do when fellcleave fails? Or a Dark Knight that stunned the healer at just the right time? Clearly Dark knight is the worse job here, they just did the right thing at the right time.
If you want to rate the ability to carry in Solo queue based fully on RNG teams without considering balance as a whole that's fine.
But I personally would rather rate balance as a whole, have some discussion on that balance and maybe even possibly have the developer make correct balance decisions based on our feedback.
Edit: Since i'm gong to sleep now I'll leave this here as well.
Your mileage may vary in solo queue from astoundingly bad players no matter what job, to astoundingly good players. I can easily say i've seen huge variations in player tendencies, from people breaking sleep often, to near perfect CC and even limit break coordination, I've seen tanks with 9 stacks go right to the enemy and die , and I've seen players in general with multiple stacks run and hide to time out the match.
Basically what I'm trying to say is no matter what solo queue will always be about the skill of your team versus the skill of your opponents, if everyone is equal skill, tiers come into play and balance is easier shown, If anyone on the team is less than skilled it wasn't a fair match to begin with.
Worry about the player first, then the job, good players will coordinate just fine, there's nothing you can do to carry a bad healer, a tank or dps that doesn't know how to fall back, or a DPS that can hardly DPS and dies all the time,(well maybe you can carry this) that winds up being specific to the job aside from making smart plays and decisions yourself.