Same. I recently started using her. Love her kit. She's definitely hard to solo support a team, but its possible.
What bugs me the most tho is when my team wake up someone I slept. Sometimes its on accident but other times people just don't understand how powerful it is to knock someone out for 6 secs of a team fight.
Lol or when you're trying to nanoboost someone and the wrong teammate gets in the way. 9/10 times its Mercy flying to someone.
Unscooped is more difficult for me with timing the delayed shot, but im getting better.