The Engineer is easily one of the most powerful DPSes in the game, and it's mostly due to the X-1. IMA and BHS are cute, but the X-1 essentially doubles the player's DPS output passively, can fire on the move, has a one-size-fits-all weapon, does not consume ammo, and can gain increased damage the more kills it gets. The leveling is slow at first, but once it gets "up there" thanks to Overdrive, things get a little silly. NOTD is "dying" because Starcraft II is "dying" - overall attendance has been at record lows partially because people are waiting for Legacy of the Void and partially because Blizzard has rolled out two new games (Hearthstone and Heroes of the Storm) and two expansions to massively successful properties (Reaper and Warlords). NOTD will not be receiving major content updates or balance updates for an indefinite period of time because we are focused on NOTD 2. This does not mean that NOTD has been forgotten - we will still be implementing bugfixes to repair catastrophic issues that may arise from Starcraft II being updated. However, it does mean that we're not too terribly concerned about NOTD's balance issues - the game is five years old now and we're working on a bigger and better sequel. There have been murmurs of implementing NOTD 2's updates into the NOTD game as a Special Edition Update or something similar and keeping the original map/balance as NOTD Classic, but we have yet to actually reach the point where NOTD 2 is in Beta so that's a ways in the future.