Let's not forget that it's a TATTOO we're talking about, not a needlepoint that a 12 year old girl made for her grandmother's parlor. If you're such a tremendous bad ass that you've covered your whole body with tattoos, I wouldn't expect you to get all teary-eyed over anyone's opinion of some of that ink.
People who consider tattooing to be an art form have a lot of standards that they want to see met before they deem a tattoo to be "good." They aren't the same standards that art done on traditional, non-human mediums is judged by. If someone asks for an opinion on their tattoo, it should be judged on "tattoo as art" standards, not by the amount of work involved, or the intention, or even if the person it was made for likes it.