Ok then, bland characters? The characters are energetic and lively. Not all of them may have compelling back stories, but their interaction with the world is far from being bland. Voice acting being annoying is understandable, but at least there is some acting in it.
Everyone sulking over their indecisiveness in 5cm/s isn't exactly what I would call interesting. No real character development even took place, only some set up in the first chapter and then it just stops. And voice acting is totally forgettable.
Music is subjective, but to dismiss it altogether becuase you don't like it is pretty unfair don't you think. The most interesting piece in the movie is Masayoshi's song, which I agree is better than the vocal pieces in tokikake, but tennmon's tracks are hardly special compared to his past works or to tokikake.
Mokoto Shinkai's biggest problem though, is story telling. Straight forward, nothing interesting happens with no real ending except for a montage for some closure (of which you still need to read the novels to fully understand and appreciate). This is not bad writing, but it's not good writing either. I'm sorry, but compared to tokikake, the way 5 cm/s' story is presented seems pedestrian, lazy even. There's also significantly less actual animation going on, since Makoto Shinkai always relies on beautiful stills. He even chose not to animate the characters more realistically because it would draw away from the background. There is nothing necessarily wrong with this artistic approach, but I fail how to see this implementation is superior to tokikake.
I've never mentioned that 5 cm/s is a bad movie, just that it isn't as good as people make it out to be. Makoto Shinkai was impressive with Voices of a Distant Stars, but he's only being riding on it's fame since. 5 cm/s has the flaws you tack onto tokikake and then some, for it to be "better" is once again, perplexing.