It’s not like Summer’s deficiencies as a character only exist because we didn’t get to know her well enough. She’s a terrible character because we learn basically nothing important about her in the entire time she stays on camera.

There’s more depth to Timon and Pumbaa if you think about it. Summer just rambles about unimportant crap and never once shows the overly emotional (read: pussy) protagonist any notable bit of affection.

In summary – annoying character falls in love with boring girl who doesn’t appear to like him and then spends way too long whining about it until it inevitably fails.