Just to add to my buddy Banarok's comment, even though I have different opinions.
My quote was pretty much used as a joke to those who said "Hey, doesn't this give you IS vibes" or "Doesn't the main girl remind you of Louise in ZnT?". YES, they do. But as a matter of fact, I can draw comparisons from here until the roots of a Chinese wuxia novel, and I can do that on most of the new light novels nowadays. But basically, the current type of harem-sub-plot story is about protagonist + 3, 4 girls. These types of novels include High School DxD, Infinite Stratos, Hidan no Aria, Campione, and I can go on and on with this.
tl;dr : Don't mind the possible similarities, it's not new.
Now, for the actual review:
Seirei Tsukai no Blade Dance has possibly one of the greatest protagonist if you compare to the usual type of light novel. The thing is that he's not weak and becomes strong, but rather "was strong" and saw his powers cut off. He is not led by the nose by any of the characters so far, even if those cute girls try to make him theirs. XD
As Banarok previously pointed out in his review, Seirei Tsukai no Blade Dance is easy to read. That is often a great quality when it comes to novels with fighting involved. The author has to make it interesting enough and keep the different terminologies the most simply possible. The sentences are short and simple, and they flow quite well.
The other thing that is fairly intriguing in the plot is what happened in the past. Very early in the story, we can understand the the term "three years ago" is the root of the story. The past of Kamito and what he used to be will be the reason why many of you will continue on reading.
Like many other good stories, the story is light-hearted, comical in the first part. However, there will always be a serious fight happening in the latter part of the novel.
tl;dr : Go read the novel, it's worth it.