I really like the grouchy aura, but honestly, the rest of the Grouch trait doesn't really make sense to me so I'm not sure yet if I'll use it. We already have Mean and Hotheaded as well as Goofy, which was changed to revel in pranks, which I found to be disappointing and a bit inaccurate. I just don't think of pranks when I hear "goofy" so I removed it from my Sims when it changed. I also definitely don't think of pranks with Grouchy either. It just seems to me that the trait effects should have been put onto the existing traits we have to make them stand out more. I'm also just generally not a fan of pranks and practical jokes anyway, so I tend to use those types of traits sparingly because they get old and tiresome really quickly.
I think they were just going for a Grinch Trait for the holidays, so I see what they were doing, but it's so specific that I just don't see its long-term use. I could be wrong, though. Maybe I'll try it out one day.