I spent years maining various versions of thief and mesmer, *precisely* because stealth was such a broken mechanic, in combination with all the other instant "get out of jail free" abilities and mobility. It gives you an incredible amount of freedom as a roamer/ganker. Oneshot out of stealth, safe-stomp, back into stealth, disengage when cd's are low ish, repeat. 'zerg surfing' was one of my favorite things to do as D/D thief. This isn't even just thief - PU shatter mesmer was one of the trolliest builds I ran back in the day. Trapper ranger and DH were also pretty oppressive at some point though I didn't play those myself. The only reason I (and many other stealth enjoyers) stopped playing these was because of all the flavor of the month sic 'em soulbeasts, DH tethers, and holos with the 'reveal if you ever hit anything' trait that made it hard to abuse stealth. But those are pretty rare now (and don't have nearly as much ranged oneshot potential either), so we're seeing a lot more thieves being dusted off the shelves again [and complaining loudly about cele, despite still mostly winning the 1v1 against cele builds]