Pros: I was hesitant about booking with Saudia. Honestly, it was a bit scary beforehand to be flying through Jeddah. However, my fears were entirely misplaced. It's a well run airline with some premium features, especially given the price point. The entertainment is good. Much better than other middle eastern airlines. The food was better than average and the service was definitely better than average. I would fly them again in a heartbeat before I flew other budget carriers such as Egypt air (shudder), Royal Air Maroc (passable), and Ethiopian Airways (ugh).
Cons: This wasn't a huge deal for me, but:
No alcohol on the flight! You can't even bring alcohol in your checked luggage.