Watch the series in it's entirety, then wait 3 months and see what you think of it then.
We all hated Yamato while we watched the series. It's hard not to considering all the stupid things he does. Suzuka is a huge bitch through
most of the series. But, that's really her character. It's called Tsundere (see
wiki for details). It's really one of the more realistic romance animes. Real life romance is not perfect like so many anime's display. The female lead (in the imaginary real life drama) is rarely so selflessly devoted to the protagonist. Suzuka loves a dead guy. To her, he's perfect. It becomes very difficult for Yamato to surpass him, but that's exactly what he tries, and eventually it works. As for Suzuka, she gets jealous of Honoka taking away Yamato's singular focus on her, and in ways attempts to sabotage their relationship. Honoka's character has no self-esteem and gets jealous of Yamato's proximity to Suzuka eventually leading to their breakup. Honoka also loses her near-angelic calm and berates Suzuka for being a heartless, selfish bitch. It's wonderful.
Yamato's most noteworthy characteristic is his determination.
Suzuka is a harem series, but for the most part, Yamato doesn't play the field and date every girl in the series. He dates only two in the course of the anime. Even when he's dating Honoka, he only sees Suzuka. There is never any significant wishy-washiness about who to end up with. It's implied that he only accepted Honoka's confession due to shock. Believe it or not, that's incredibly rare.
Watch the series again, and take a deeper look at the character developments. It's rather comprehensive, and more realistic than "Wishy-washy idiot gets with angelic, selfless, childhood-friend-turned-beauty after sifting through countless other girls swarming him" series. Then wait three months and try to take a deeper look at each of the characters. I did, and stopped hating Suzuka and the series. Real romance is never smooth, and
Suzuka displays it in a fairly accurate manner.
NOTE: The manga is nearly exactly the same. Minor differences such as a hole between their rooms, changes in plot that don't change anything overall, more ecchi and nudity, and plot points inserted so they can be reintroduced later (how Honoka deals with their break-up).
The relationship in the manga is as rocky as the series, and it seems to be continuing that way. Yamato's behavior however, continues to impress me.