Amagami SS is an interesting take on the traditional romance anime; instead of choosing one path and then having to make OVAs for the other paths, why not showcase all of them together! Thus you have a ~26-episode slice of life comedy/romance where Junichi eventually wins the heart of six plus one different girls (plus one because Risa only gets one episode rather than an entire arc, and Junichi already had the heart (in a non-incest way) of his Ni-shi-shi little sister the entire time).
Though it may seem a bit choppy having the main character choose different paths (previous heroines show up as "cameo" appearances later), the plot sequence and character development for each arc is superbly done. And as mentioned by previous reviewers, the girls are all very unique so you're bound to find someone to root for.
All in all this is a pretty good romance with a smudging of occasional humor.
Animation:
The animation is good for its era, with crisp lines and solid coloring. The character designs, like the character personalities, give each heroine a unique style, though all are cute in their own way. My only qualm is that the "fat" girl (Rihoko) is still relatively thin by American standards, guess there is a culture gap after all... The actual setting isn't anything all that special, mostly around school with a few deviations. There isn't any particular color emphasis as I guess they were emphasizing the normalcy of it all and how Junichi can be any male viewer, who happened to have been dumped in the past and what not.
Sound:
The OPs are fairly decent but not so much to be collect worthy. The first OP is a light and playful tune, which is a good fit for the mood in the series. The second OP is a bit more decisive but still relatively light-hearted. Each of the 8 (six main arcs + Risa + Miya) girls has their own ED. The BGM is supportive and fun but nothing that special. What really stands out in this category is the VAs. Itou Shizuka gives so much personality to Haruka that her seductiveness approaches Horo levels at times. Nazuka Kaori also did a great job with Ayatsuji as it must have been very difficult to make her personality switch feel natural.
Story:
Tachibana has been heartbroken and gf-less for two years, after a date ditched him on their Christmas date. Now he gets a second chance as new encounters with girls abound. You pretty much know what's coming in most of the arcs but how they get there is fairly unique at times and creates some moments of tension (like that feeling in the air before you kiss) that are just great. Some arcs are bound to be better than others, and obviously impressions will be based on personal taste. I liked the Sae arc but my friend skipped the entire thing. Not all paths are linear as well, as Junichi faces significant challenges on the way to winning each girl's heart.
Character:
The character development is wonderful, and you get a feeling that the character bonds indeed grow as each arc progresses. Tachibana himself is an interesting character has he is somewhat nice and shy at first, typical, but a bit different from normal harem guys in that he can actually make decisions and hard choices. Though I'm not fooling anyone- it's the girls that really define this series. Haruka, Sae, and Ayatsuji were the standouts for me as each have very different tastes and personalities and were just fun to watch as they interacted with Junichi (whose head voice you hear repeatedly through the series).
Value:
This is a very good light romance watch. You get a believable work with girls slowly liking a guy (w/o the girl vs. girl drama traditionally associated with these) and a very good story progression to go along with it. Add in a nice supporting cast with a interesting sister and you've got yourself a winning package.