I know that for a while, Wardens were far and away the best solo class in the game. People used to call them a one-person fellowship because of all the wild stuff they could do on their own that other classes simply could not.
But then they suffered several nerfs to their survivability, Beornings were released and a few years later revamped to become the best solo class in the game, and they stopped being seen as viable tanks.
When I first tried out Warden, back in their heyday, I wasn't a big fan of the gambit system but it seemed like an acceptable tradeoff for their best-in-game solo ability - they were harder to play, but the results were very rewarding. These days, what unique advantages do you get out of Warden in exchange for having to deal with gambits?