This manga is an incredibly enjoyable ride. The only thing is, you have to keep in mind that it should be placed not with Love Hina or Ai Kora (good mangas in their own right), but rather with the likes of Asatte Dance and Living Game. It's kind of deceiving, really, because Suzuka's got the formal attributes of a school ecchi/harem romcom, and takes some time to pick up the steam, but what you actually get is a realistic, psychologically convincing story of a young couple's transfer from teens to adults (can you say Bildungsroman?). Oh, you're bound to wish to smack them many times throughout the series, but it's not because the characters are unconvincing - it's because they are, and they act according to the rules of real life, not the naive and simplified preconceptions of what relationships are like.
Considering that, the ending, which took a beating from some of the commenters, is actually organic and fulfilling as well, as long as you remember that this is a realistic manga, not a harem/idealized love story. In fact, I'd hold Suzuka's ending as one of the best things about this manga, for both the sense of emotional closure and being so damn positive and uplifting. True, there are so many mangas - as well as books, movies etc. - that botch their endings, unable to come up with a logical conclusion to the plot and character development. But Suzuka clears the hurdle with ease and grace (come on, where else to use a track-and-field metaphor if not here?).
The only complain to be voiced, IMO, is that around Vol 6 the quality of scans takes a dip to plain shitty. Kudos still to those that scanslated the chapters, but it would be great if Dynasty or anyone else would've finished the job of releasing good quality scans of this manga. Seriously, it's so worth it.