I think people can be snobbish gear-wise, and it may not be as important as you might be imagining. You can be the best geared hunter on your server and a terrible player as well. Or still have marginal gear, and make up for it with smarts and play.
But simply surviving something like T2 Foundry or Roots shouldn't really be an issue for a hunter with crit-crafted/purple loot gear. Your damage output will be a bit off, but that's about it. The thing that makes it sometimes tough to find a group as a hunter to a certain extent is that.....there are a lot of hunters. Which probably sounds unhelpful, but at least on my server "Foundry T2 - just need Tank and Healer!!!" isn't atypical for glff....... A problem compounded by the fact that most Captains/Burgs/LMs/Minis/RKs/Guards/Wardens have as many medallions and seals as they (or their alts) will ever need without trying hard.
But the best way to make sure you're invited to the Foundry or Roots pug is to make your own! And don't rule out Draigoch. If you have the instance it drops a ton of medallions/seals and of course, the helm and shoulder coins. The armour coins are usually easy to get at this point and are quite often left in the box because nobody needs them.
In any case, keep trying, and after you get the Draigoch set, work on getting Orthanc wings unlocked. Most of Orthanc T1 is pretty much a faceroll at this point and I can't see too many people being overly picky, gear-wise for a random pug. And as mentioned, the Limlight Jewelry set is the best going and can be easily obtained purely solo.
Parahelion - Burg, Krustii - Champ, Shurmann-Cappy, Tommac-Min, Lazarrus-LM, Thromdir-Hnt, Theodolan-Grd, Kozzmeaux - Bear - Dancing in the Dark kinship.
Wrecks - Warg - The Black Blade