When you say "All the characters are a little sueish" it completely waters down the use of the term "sueish." Any given Twilight character has "sueish" tendencies, for example. Does FMA portray it's characters in such a lovingly purple prose-y way? Of course not!

Also, flaws don't make a character- too humans aren't perfect, but too many flaws just gives you someone unlikeable. Or Yoki.