The only classes that go down in "2 sec" are glass cannon Elementalists and glass cannon Thieves.
Even those may not die if Final Shielding/Earth's Embrace or Last Refuge trigger.
On my Warrior I kill those in 2s too, without even going full glass cannon. *shrug*
The only thing I find OP in the Thief is the whirling axe you steal from Warrior.
God, that thing is a 10k AoE.
I've regularly downed players on classes and specs other than those in under 2 seconds on my thief. The catch? There is none: They're in the top 15 players on NA and they didn't * up their skills either.
The better question is whether or not we should cry about that.
First off, everyone and their uncle is now running around exploiting with svanir runes on guardian and elementalist, dropping mist form self-full resses liberally around points while being invincible to conditions and nearly impossible to burst regardless. The second most prominent team on NA does this extensively.
Top players are forced to run glassy in order to deal with the hyper-effective bunker elementalists and guardians. Tanky engineers aren't as much of an issue because they can be dealt with by any consistent application of immobilize (shortbow stealth 1, dev venom, leg specialist, mesmer sword 2, signet of earth, guardian hammer 3 and so on. Most players have no idea what separates good guardians from bad ones, too, because survivability is so easy to obtain; they don't notice that guardian v guardian is about mindgaming around hammer 4 and counting weaponswap timers. Since its so hard to kill them, either you're running an intense condition comp to try and overload his removal (and then get shat on when they run an ele/guardian bunker combo that shrugs off tons of conditions), or they run ultra spiky to spike down the opponent's also ultra spiky individuals on point.
Just to drive this home: there's less than a handful of players in paids on NA running warrior to the point where everyone knows hmann just by virtue of him being the only person there. He bursts harder than any thief spec, using whirlwind to proc 8-12k aoe instant damage without startup or setup required. Dying mid on foefire after forcing a bunch of stunbreaks, then running back on a short res timer to hit assured ww->rush->hb combos is pretty standard business for him.
Hybrid builds exist, but they're generally niche; tankier mesmers running portal to support from homepoint generally run the bulk in order to mitigate up-front thief burst, for instance. Plenty still just run pure glass regardless because mindwracking the point for 10k then dropping a timewarp wins team fights and establishes point control for a guardian that's going to require a 2-3v1 to displace anyways. People aren't asking for a mesmer's dom sig, mindwrack, sword 2-3, cry combo to be nerfed either, which has no startup time, similar cooldown, does equivalent damage to the backstab combo, but in an aoe and also applies stun AND immobilize, making it unavoidable for a number of classes even with stun breaks and which synergizes with any other members of your team attempting to spike by limiting your opponent's options for mitigation.
That said, the combo's too easy and it makes shitty thieves look competent, so please make my class harder.