Well it's not really ok, as trying to maliciously impersonate another user is a banning offence:
Impersonating Others
Persons maliciously impersonating any other user or person here will be permanently banned. In the past people have impersonated others here in a humorous way, especially celebrities and well known people. We do have a sense of humour, but to ensure your joke is not potentially harmful, please make it clear you are a comedy impersonator and not the actual person. For example don’t register as “Barack Obama” but “Barack Obama Clone” or “Barack Obama Fan” would be fine.
Plus there is the little issue of whether somebody was trying to slip in a fake review by making it look like it came from you. I note that it's a positive review, but it could just as easily have been a negative one.