Been gone a long time and know I missed a lot

[Satarn]

Dark knight is not weave heavy. Its essentially WAR.

Well, it is weave-heavy for like, 10 seconds once every minute... and then you go back to sleep.

Can people give me a quick run down on the current state of tanks and where to go for more information on where each class stands and play suggestions?

As for where each job "stands" - all 4 are perfectly adequate for any tanking and all tank comps are viable in content as both MT and OT with very, very slight advantages between them. DRK/WAR are a bit better at MT/personal mitigation, while PLD/GNB do slightly more damage, with PLD being a tad weaker than GNB but having some extra utility(but again - these differences are very small).

The playstyles are also super simple in both mitigation and dps aspects and close enough to each other that you should have zero issue switching after you learn to play just one of them, as many of their elements work analogously or even straight up the same. You might as well just pick whatever speaks to you the most aesthetically and if you want to change later for whatever reason, it's easy enough to just level another job, especially with how fast the dungeon queues are for tanks.

Overall tanking has become extremely easy this expansion so it should be no problem getting back into it. If you just want to play something "comfy" then you can't go wrong with tanks, although you might find them a bit lacking in the challenge department after playing for a while.