It depends on the strength of the user vis-a-vis the subject. It's possible to try 'full on do-my-bidding type', but it only works on the weak-willed. Mind Control can be detected by the subject and resisted, and Anti-Mind Control devices of varying effectiveness are common in stores. However, a really powerful and subtle Mentalist can circumvent all of this.

Illusions can cover all five senses, but most Mentalists are only able to do sight.