Experienced in cluster bombing residential areas maybe.
They had constant air superiority for the last two years and still haven't broken the houthis while flattening sanaa and it's civilians
There is a bunch of reasons for that:
Lack of precision bombs (from the US since Obama froze it), bad intel (Their target information is actually from the UK and US recon planes), Houthi store houses in residential zones, mountain bunkers,
and being an overall asshole.
Here is the current map of Yemen:
There is also the recent fact that the South basically now wants to split from the North that ruled over them after a forceful merger.
https://www.youtube.com/watch?v=rucpSETPaPQ&utm_source=dlvr.it&utm_medium=twitter
They basically announced on May 21st that they are now starting a Secessionist Bid.
Of course the Saudis never planned that but if anyone say the conflict before the Saudis intervened they basically knew it was only a matter of time.
Now we will have two Yemens again... The South is the place with all the resources though.