After episode 1, I was actually surprised to want to watch the next episode due to how close the show stuck to the manga's storyline. With a long line of let-downs in the last year for adaptations, I had made sure not too have to much of an expectation for this show, and I'm glad I did as its proven to be just above what I had hoped for.
Without going into detail, Omamori Himari is the story of Amakawa Yuuto, descendant to a long line of demon slayers, and his kick-ass sexy feline guardian Himari Noihara(demon neko-mimi or cute puss-in-boots for you westerners). Add in a 'tsundere' childhood friend, a loli, a maid waitress, and an 'ojou-sama' like fiancee and you have the rest of Yuuto's "cliched harem" as they try to handle co-existence with youkai(demons) and humans alike due to Yuuto being casted as one of those sensitive new age guy who doesn't like violence(the type of nose-bleeding harem male you love to hate)
Now this show falls in the genres of Action, Comedy, Demons, Romance, Harem, Supernatural....which sound like ingredients to a great plot and story, but coming from a creator who's previous works are hentai, what you will see is fan-service, cliches, fan-service, loli-action, fan-service and a lot of ecchi(as a male I have no problem with that....oh and did I mention fan-service?)...well I guess the benefits of a H-mangaka is that you can expect the artwork to be top-notch. From the 3 sizes(of each heroine) to Yuuto making out with a few of the leading ladies, they've made sure to cover the right angle shots in detail(which some will find very ero-ero....if you can get past the censorship that is...hopefully there'll be none of that when DVD gets released).
The OP and ED are ok but not something to start looking out for on your next karaoke session and the BGM can be classed as elevator music(well not as bad). As for the voice actors, you have a great line up of seiyuus(Tenma from School Rumble being Himari as an example, and the cute Kuro from Kodomo no Jikan as Shizuku for those loli-lovers ^nano). The only thing I wasn't pleased with is Yuuto's VA, which I feel they've miscasted. Those who've seen School Days should know what I mean. Everytime I hear Yuuto's voice whilst Himari's trying to flirt with him, I get that spine-cringing feeling that someones out of place. I do feel sorry for that seiyuu as its not his fault for being the VA to Makoto(probably the most hated male lead in all of harem time), but he just does not suit being a harem lead.
All-in-all without discriminating the show from the seiyuu, Omamori Himari is a worthwhile anime to watch. From the producers ZEXCS(who gave us Regios, Rental Magica and *vomit* Da Capo), here's hoping they don't stuff this one and give us a bad ending, or in Makoto's term a "nice boat"....
If your looking for Nyan Koi replacement, I'll advice you now your not going to get it. As long as you don't come with no expectations, I can safely vouch that this anime will aim to please
