After watching a number of anime series, I actually found Da Capo to be quite interesting. It works on several levels, if one chooses to watch closely enough to notice some of what its trying to do.
Just a few examples: The title (Da Capo - a baroque musical form) is reflected not only in the overall design of the plot, but is also part of the theme, message, and the vast majority of the atmospheric music is baroque in origins to reinforce the point (though the title song is a more pop style to appeal to casual watchers). The girls, seemingly random character stereotypes, are actually designed to represent specific figures of the Juunishi (zodiac), which again ties into both title and themes. Answers about the side episodes involving "Mr. Mysterious" (the "Cat Man") are not handed to the viewer, but aside from the artistic and comedic values they may have, there's a number of hidden allusions in the sections, as well as allowing the viewer to apply some of their own meaning, much like an abstract painting.
Yet on face value, the show is largely a romantic comedy / drama. The comedy had me laughing aloud in some sections, but as with most anime (as compared to many American cartoons), you won't have joke after joke tossed at you. Much more buildup to the comedy, as well as jokes built into situations/ characters that are likely not noticeable if you haven't seen a number of other anime. The drama does feel a bit drawn out, especially in the last few episodes, though with most good anime, you're never quite sure how it might end. At the least, the ending doesn't feel out of the blue.
In the end, I'd probably only rate the anime as a 4 or 5 on the base plot and comedy/drama portion. Good, but there are many anime that do more on that level. Yet, Da Capo is probably one of the deeper animes I've seen (and in a rarity, it does not hand the depth to the viewer on a platter). It is built artistically, reinforcing its themes in a variety of ways, and as you pick up on the "extra" levels, it really makes the viewer think, and even desire to watch it again, seeing it in a bit different way.
Watch it for the laughs, or for the romance, or drama if you like. Its fine to simply enjoy and leave it at that. But there's beauty in there too, for those who would reveal it slowly and carefully.