When I was younger and stupider, I used to think meatloaf was what got made when people couldn’t think of anything better and it would “just have to do”. Oh, how wrong I was!
Meatloaf is good eats! 
FWIW, I usually can’t help myself and put in a good drizzle of liquid smoke when I’m putting stuff together. Oh, and for the onion part of it, I kinda like to caramelize them a bit before putting them into the mix just because I like 'em that way. I like a bit of garlic in the pan with the onions with a bit of oil towards the end just to get some more flavors going in there. A good healthy sprinkle of Italian seasonings tastes good to me, too. Lots of optional stuff, and usually just what I happen to feel like when I’m making one. Plain or fancy, either way, meatloaf is good eats.