My recommendation for every Ethiopian restaurant is to get one veggie combo platter and one meat combo platter for every two people. You'll get a mix of flavors and spice levels, mostly hot but a little cold, and lots of injera. A meat and potatoes guy isn't really going to find anything at an Ethiopian restaurant that resembles a slab of meat and a side of potatoes, but at least with the platters, he can decide which things he likes and focus on those.
Agreed. He might also like kitfo if he likes a little heat: sort of an Ethiopian steak tartare, spicy and flavourful. It is not always on the meat combo platter. Most restaurants ask you if you want kitfo cooked - in case he is squeamish about raw / extra rare. The food is so inexpensive, you can afford to get lots and take home leftovers for the next day.
Ethiopian cuisine is one of my favourites, and almost everyone I introduce to it enjoys it. I hope you do too.