is this an opinion of taste or judgment? If its taste then why make an analytical argument? If it is judgment then you should say kratos fails to meet certain criteria that makes an excelent character, then list the reasons why you feel he fails to meet the accepted criteria of a good character. that way your less likely to spark a flame war.
"but Kraton is just so uninteresting and generic looking in every way"
"I just don't see the appeal."
see how by the first judgment, you open the debate for analytical argument then mix your opinion of taste in there which gets things all messy, try and keep it organized next time.
keep in mind that there is no wrong opinion of taste, for example "i think nathan drake looks stupid" can't be argued, however opinions of judgment can be wrong, like "i think naughty dog failed to create a believable character in Nathan and here's why:(list). can be wrong.