Usually, i hate the incestuous themes that are inserted in anime (see Sword Art Online's second half). Actually I really hate incestuous themes at all. But my opinion about it somehow changed and I now know what I really hate about this kind of anime. It is the ultra-clingy imotuo. I can't stand them at all.
As a result, I really liked OreImo.
Story - 9
These specials serve as the ending of the series. Some might say that the revelations were done hastily but in my opinion, its pace was just right. The story really becomes interesting 10-fold per episode (ok, a little exaggeration on that statement).
The characters are well drawn and at par with the currently airing anime. The background was also well drawn and did not look like half-baked.
Sound - 8
The OP and ED are pleasant to the ears and that Meruru theme song was just so addicting! On the BGM side, it was like as if you were playing a real visual novel. That idea made me laugh inside a few times. It's really enjoyable.
Characters - 10
Every member of Kyousuke's harem have their special traits that will make the audience love them. But dont get the idea that these episodes are all about Kyou's girls. I just like mention "Kyousuke's harem" (lol).
Enjoyment - 10
I recommend this (the whole OreImo series) to those who want a good laugh and maybe cry a little inside at times.
Note that these specials are the only ones that I gave a perfect score because I liked the climax and the resolution in the end. :)