In my opinion, Tayutama was one of the worst anime of the Spring 2009 season of anime.
The plot begins with Yuuri, a loser high school student (*cough* Hideki, Keitaro, Keiichi *cough*) summons a goddess (Mashiro) who falls in love with with him quickly decides to marry him (which he has to do). It's up to them to battle the Tayutai, and protect the world, etc. Not the worst story in the world, but defiantly not that original for anime.
Then the harem begins, with other blushing girls being thrown in: Ameri, Yumina, Mifuyu, and later Nue. So not much original here: Basic supernatural ecchi harem. Did you know this anime is based off an adult game? That shows the concentration of the character's looks and general artwork, but total lack of original plot. The 'battles' against the enemies are also quite lame, and usually result in everyone becoming friends instead of actual defeat.
Not only are most of the characters generic, but most of the girls have extremely annoying voices, especially Mashiro and Nue. Combined with Mashiro's Chii-like personality, she's downright annoying.
So I recommend people avoid this one, unless of course you enjoy ecchi harems, in which case you may enjoy it but don't expect it to measure up to good harems.