My ratings are (generally) 60% quality-based and 40% enjoyment-based. Usually anything 8 and above are things I genuinely enjoyed and will recommend watching (depending on who you are). I may actually like some things with an 8 more than those with a 9, but I just happen to consider some honest flaws in the show (which I may not have actually minded). Then again, sometimes I consider the grade based on how well the show "did what it was supposed to do".
Sometimes the ratings can change after I think about it for a few weeks; most of the time I recommend reading the "notes" for each anime. And yes, I enjoy blatantly commercial bog-standard anime! I don't have "good taste" in the least bit and don't intend to develop one any time soon.