Unfezant. It's best non 2-turn flying attack is Pluck, It had many special moves and support moves but lacks the stats to use them(Wish with that HP stat won't heal much without investment). It sits and an awkward base 93 speed, and now Pidgeot's faster. It would actually be a halfway decent pokemon if it had a flying STAB worth a damn.
Pidgeot is bad, but it's one of the coolest and is a classic. You can't argue with a classic. Noctowl is also cool and is different than the rest. Swellow is okay in strength and looks very badass. Staraptor has a weird hairstyle, but it looks pretty badass and has an awesome cry, besides being very strong (the famous YOLObird). You know you are screwed when you hear that cry, as it will tear your team apart. Talonflame is the strongest. Its design is okay, not very inspired (most of the others are way cooler). But kudos for gamefreak for making a generic bird that is one of the biggest threats in OU. Braviary looks very fearsome, even though it kind of sucks. Fearow looks like Pidgeot's evil counterpart, it's awesome.
Unfezant is just ugly, without the added benefit of being good (unlike Talonflame).