[Zak]

Aside from being easy to cheat on, multiple choice tests are bad measures of knowledge/ability.

I'm good at them. I can often infer the desired answer from the phrasing of the question and answer without actually knowing enough about the topic to answer correctly in a free response format. I can almost always eliminate a wrong answer or two that way even if I can't necessarily pick the winner, improving my odds.

Some people are bad at them, especially when the test demands the "best" of several defensible options.

In either case, the test results in an unfair and inaccurate estimate of the evaluatee's performance.