Final answer:
The argument is invalid and weak because it is based on a limited number of instances and does not provide enough evidence.
Step-by-step explanation:
The argument presented is invalid and weak.
Basing the conclusion that the cafeteria is bad solely on two instances of eating there is not enough evidence to make such a general claim. It is important to consider that individual experiences may vary, and the actions of a few individuals do not represent the entire staff of the cafeteria.
In order to make a stronger argument, it would be necessary to gather more evidence and examples to support the claim.