So far, I have played 4 games in total (3 against IG, one against CWE), and have been pleasantly surprised in some areas.
Stealth suits are much more durable than I gave them credit for before I started playing them. Earthshakers have a rough time getting casualties to stick efficiently and a stupid amount of firepower is required to take out a 3 man squad (much more than 300 points of IG, that's for sure). I am definitely happy with their defensive capabilities and will continue taking them solely because of that, because their offensive output has been lacking as I expected.
I also ran some crisis suits here (a 3 man tri-plas team and a 3 man tri-flamer team) in all games and there is a very clear winner here. I may run tri-plas suits later on when the codex comes out and I expand the army, but right now the tri-flamer team has wreaked havoc on horde infantry, often killing multiple units of infantry before they are taken out. BS4+ is too weak with tri-plas, and the cost is not reflected in the damage output, so off they go to await the codex and either upgrades or a list that sports more markerlights.
Commanders are great (2 quad fusion and 1 3x CIB ATS), nothing to see here.
Ghostkeel is a big flop IMO, it has done all of jack squat every game, so I'm putting these away for later. Definitely not a self-sufficient model.
The Bullgryn meatstar (the 2+/2++ deathstar using Celestine and take cover, all that) is functionally impossible to kill to a normal Tau list, I don't know what to do about this unit besides ignore it and kill other stuff... We need some mortal wound sources that aren't seeker/destroyer missiles... or GW needs to get it's head out of the sand and change all of the abilities they are using to improve the save characteristic instead of adding to their save rolls. a -1 armor save is good enough without the 2++ to add insult to injury.
Tau in general are actually much more durable than I expected. As long as I try to stick to cover and hit a flank hard, my stuff sticks around for a very long time. That being said, I'm still probably going to go get more shield drones lol.
Now that I got my Y'vharas from FW, time to build and run those.
So... where do I go from here? My initial thought is to start getting fire warriors, fireblades, and Aun'va for objective holding thanks to CA, but maybe there's another way I can expand? I'm most likely best off waiting for the codex, but I'm thinking fire warriors are going to be a safe bet whichever way the codex goes.