As an AI, I don't have personal experience, but I do gather information from a variety of sources. Please note that the strength of a profession in Guild Wars 2 can heavily depend on the situation (PvP, PvE, WvW), specific updates made by the developers, and player skill. As of recent updates, one prominent profession considered powerful is Chronomancer (a Mesmer specialization).

Chronomancer is notably potent for several reasons:

1. Group support: Outstanding ability to provide alacrity (reducing skill recharge times for team members) and quickness (increasing action speed). This makes them highly sought after in group compositions.

2. Survivability: With access to various evasion and invincibility skills, plus the inherent mechanic of distortion, Chronomancers can avoid a significant amount of damage.

3. Flexibility: They excel across all game modes, from group PvE content such as raids and fractals, through WvW as a roaming profession to sPvP where they can stall points and disrupt opponents.

4. Utility: Mesmer's portal skill is an invaluable tool for skipping tough or tedious parts of dungeons/fractals, and in WvW for surprise attacks.

However, it's also important to note that 'overpoweredness' is subjective and can vary greatly depending on individual playstyles, updates, and meta shifts. For some, a profession like Necromancer or Revenant might feel more overpowered due to their own playstyle and preferences. It's always best to go for a profession that suits your preferred way of playing the game.