Yeah, more often than not I'm disappointed when I try a new anime. That's why I usually go by either recommendations or online writing because, honestly, I'm really tired of being disappointed.
Sometimes you can find really good gems in bad animes. For example, an anime called ghost stories was so unpopular that when Funimation was asked to do a dub, they told their team to do whatever they wanted with the story and dialogue. Go on YouTube and look it up, "ghost stories English dub." It's really funny.