Weaknesses
Innatist theory does not acknowledge the social aspect
Acquisition/learning is successful, but formal education is even more beneficial.
Monitoring focuses too much on accuracy; broken speech
Natural order is flawed because everyone learns differently
Input is too generalized when defining levels.
Affective filter can make real life harder due to sheltered classroom environment.
Strengths
Innatist theory explains how children can learn such complex structures of language.
Acquisition/learning is very effective and promotes learning.
Monitoring develops an active awareness of issues.
Natural order points out a common pattern.
Input is similar to learning L1.
Affective filter connects emotional state and learning.