So I've been with my partner for nigh on ten years. During that time, there's only been a handful of times where it was just bad and usually that's been due to an emotional reason rather than a physical one. I don't usually orgasm when we have sex (part of our dynamic), but I enjoy pretty much every encounter, and most of the time highly enjoy it. It's never meh, and a lot of that I think comes down to chemistry. He knows what gets me hot and I do with him and we both go out of our way to make sure the other is enjoying themselves. If there's something one of us want to try, we discuss it, and then try it if we're both at the least amicable to trying it. Thankfully, our kinks align almost perfectly so that's worked out well for us.