True, but we also aren't limited to just a handfull to pick from either. Especially when half of them aren't of the human race. Honestly, how many people are going to marry one of the old women or a nasty looking Orc? And 3 of the options are priestess women from the temple in Markarth. Seriously? We can marry 1 of three priestess woman but not a tavern girl? Pretty stupid if you ask me.
If you knew your lore, you'd understand why; Dibella is the Goddess of beauty and love. Her priestesses are often more "liberal"; some even offer instruction in the erotic arts. And again, just like in real life, you can't exactly pick and choose who you want to marry and who will be into you. Besides, how many tavern girls/bartenders do you know in real life who would be interested in you? I'm going to guess not many. As for those who are eligible for marriage, there are plenty of nice looking ones; everyone seems to be too focused on the ones you're most likely to meet. Of the women in Skyrim you can marry who are cute or hot, several are pretty damn good-looking for a set of pixels.
Aela
Ysolda
Muiri
Sylgja
Anwen
Camilla Valerius (a "meh" for me, but some like her)
Jordis the Sword Maiden
Lydia
Mjoll the Lioness
Gilfre
Grelka
Orla
Senna
^^^^ All these women are available after doing relatively simple and quick quests. You don't need the console (except for Lydia and Grelka since they're bugged), they're all different and they're all pretty good looking sets of pixels. People who claim there's no hot female candidates for marriage simply haven't played enough of this game.
Yeah, the younger Black-Briar girl who works at the alchemy shop in Riften is very cute and has a cute voice to go with it.
Too bad she's creepy as [censoring myself here] and terrifying once you talk to her for a length of time.