I would absolutely not, regardless of the clinical picture. Your instincts were correct. In my hospital, even in the ICU, we only push metoprolol in an emergency (they must be on the monitor and a provider must push it). Otherwise, we mini bag it and give it over 15 but they ALWAYS have to be on the monitor. We had a patient die a couple years ago as a direct result of pushing metoprolol and this has been our policy ever since. I think it's a little extreme, but at least it's safe and I haven't seen any pts suffer as a result.
Make sure you check your policy, and if it's not specifically addressed bring this up to shared governance or whoever is in charge of these things. If it is, in fact, common practice for metoprolol to be pushed on unmonitored pts in your institution, this is an accident/lawsuit waiting to happen.
Always trust your instincts and never be afraid to say you aren't comfortable with something!