I haven't had issues with Delta (aside from their website not working at all for me sometimes), but the tickets can be a little expensive compared to alternatives, so always good to shop around.
Zero problems with Delta in many years of international flights with them. The best US based company, IMO.
My only problem is that their partner for Africa is Air France aka Air Chance, a complete shit show of an airline that never runs on time, has quite rude staff, uncomfortable seats, and makes travellers to its West African flights bus out to the tarmac to get on the plane in Paris.
I guess the world is about to find out about the dogshit that is Air France and CDG when the olympics starts in a few weeks.
Okay, nailed it there. That was almost the worst part when flying to Tunis, seconded only by their very strange choice of food... I had a crash course in Muslim bidets after my first Air France trip.