The Sentinel was developed with mid-level tech and non-stealth construction. It's single engine design made loss probability higher. It was purposely built to have no leading edge technology for this reason. Embarrassing? A little. A huge propaganda victory for Iran? Certainly. A devastating blow to US intelligence? Definitely not.
Aden hotel used by Yemen goverment hit by grenade (Reuters)
from the article: Iran says it will not return captured U.S. drone