Well, one would certainly hope that every reasonably adult person would understand that.
I rarely put in caveats like "according to me" or things like that when writing about what I think of music, because it's got to be obvious that as long as you're discussing good/bad it is simply an opinion and nothing else. It may be a well-founded opinion you can argue for, but an opinion nonetheless.
Not to say that there aren't plenty of semi-empirical aspects that could be contentious ("What is catchy?") and things that are more or less indisputable ("The High Llamas are heavily influenced by The Beach Boys") but when it comes to good, better, bad or worse it's all just an opinion predicated on what it is that you value in music.