Hello, welcome to Tom's!
Two things:
1) A colorimeter gives you inaccurate results. Even if a graph tells you that the colors are accurate, they usually aren't. For accuracy you need something better, such as a Spectroradiometer.
2) If someone has a good color profile for his or her monitor, it's more than likely not going to look as good on your own monitor. The displays aren't created equal, outsourcing is a huge problem with all the major brands out there that exist in the display market. It's a panel lottery, because there are times where you get a not so well performing panel, that often times don't even meet x manufacturers own quality standard. What they do to get around this, is simply change the version number, however. They won't tell anyone about it.
I don't recommend eyeballing it either. So really, if you want accurate colors, you should hire someone to do it for you, with the right tools. You could eyeball it using the built in calibrator in Windows though. I advise you use a white piece of paper as your white, reset monitor to default, and change the picture temperature to Warm, and start calibrating. If you're going to calbrate your monitor in the dark, you will need a professional tool. However, if it looks good to you, I would just leave it at that. Instead of a white piece of paper, you could use a digital camera's histogram for instance.
If you don't want to calibrate at all, then once again, reset your monitor to default settings. You then want to change the picture preset to Movie/Cinema/Theater. That is the closest to accurate out of the box, because this mode is the only mode that's factory calibrated, and applied to all other monitors. Now due to the panel lottery, it may not always look great. A lot of people are used to blue greys, and not grey grey, so it's all preference.
All the best!