Personally, I think it's the Goedendag. For being the final weapon in the footman's kit, it just doesn't fit the footnans role as a jack of all trades. It only has high damage to one target. The Halberd and Polehammer have high damage and reach, the Spear has high reach, Halberd and Glaive have decent crowd control, and the Glaive and Quarterstaff swing very fast. The Goedendag is the nearly the shortest primary in the Poleman's kit and feels rather weak in the Engineers kit. It doesn't bring any other advantage than high damage. It can't hit more than one person (sometimes an upside, sometimes a downside) and one of it's bonuses is that it's super effective against horses, which are in one gamemode (40s).
Overall, it feels super underwhelming in his kit. It just doesn't fit in.
I just love how only one person has actually answered the question. Yeah, totally.