Answer:
Eating OM NOM NOM NOM OM NOM NOM NOM. C:
No I'm kidding.
I believe Gestalt's strengths is that they can explain ambiguous figures and fiction very well. On the other hand. Gestalt's weaknesses cannot explain several visual illusions such as the Müller-Lyer illusion.
Hope this helped, as I'm trying to find out more for myself!