Polearm Master
bonus attack, OA when moving into melee with you
Design:Two clean abilities. As a quibble, I would have preferred it if the weapons were identified by keyword (such as feats that say "when you use a heavy weapon" or finesse or two-handed etc) rather than a crude list. I won't let that quibble detract from my grade.
Fun: This feat makes your polearm feel polearmy, so, fun.
Power: A reliable way to use a bonus action for an extra attack is the cornerstone to combat power, so this feat will rate highly solely because of that. The "OA upon entry" is gravy. But not just gravy - for instance, coupled with sentinel is can stop a foe completely. Of course, that tactic is limited to once/round, only applies to melee monsters w/o reach, and doesn't prevent the monster from simply attacking someone else. So powerswise its gravy. So, is it too powerful then? I would say no. After all, you only have the one bonus action, and the attack is with a small damage die.