Eagle is good, but I am not sure if it is strong enough for tier 2. It can defend against multiple smaller ships better than Dominator, but it cannot demolish ships quickly like Dominator or Reaper Aurora. Phase lance is good, but nothing too powerful; Phase Lance Eagle is a DPS and range compromise between three blaster Eagle (high DPS, short range) and ballistics plus beam Eagle (long range sniper). What the Eagle does very well is kite with 1000+ range HVDs, Maulers, and beams (possibly boosted with Advanced Optics), and AI will try to kite with it.
Dominator is tier 2 because it can kite (not as well as Eagle, but can kite dangerous bigger ships if built for it) and/or outgun most ships in the game.