I honestly don't see the Thunderforged as something you can actually go out and collect a full set for. What I imagine the idea is, that you're trying to farm the best non-Thunderforged item set, and then if you happen to mix a few Thunderforged pieces in here and there, that's a nice extra.
Of course, if you're looking at this with the idea of "I must get a full Thunderforged set!", then you'll be disappointed.
My guild uses Suicide Kings, but I'm considering keeping a separate second list for Thunderforged pieces only.
I'm honestly not sure how good the meta gem is for PvPers. As a tank, the legendary meta gem doesn't seem all too appealing, and I'm probably sticking to the 2% armor one, which will apply to every single boss swing, rather than a shield that will be up and down without me having any control over it.
However, if it's good for PvPers, and if it's a continuation of the current quest chain, then there are some weird steps in the progression chain. There are a few steps that we actually need to go out and do, and I think it's fine to demand PvPers to do these things, as they only need to be done once:
- Watch a couple of cutscenes.
- Run ToES once for the drop from Sha. (This is only one run and can be done in LFR.)
- Kill a miniboss in Krasarang Wilds. (This is already leaning towards PvP, because it's really easy until opposing faction members start to mess stuff up. Admittedly, you need a tank.)
- Win two battlegrounds. (This should actually be easier for PvPers.)
- Likely Wrathion gives you one or two more "Do this once!" kind of quests in 5.2, which should certainly be doable.
But then there are a few stalling requirements, basically things that come along for free if you do your general PvE stuff, but if you're not doing your general PvE stuff, these would be a lot of work:
- Farming Black Prince reputation.
- Farming 10 Sigils of Power and 10 Sigils of Wisdom.
- Farming 6000 valor points.