After your class is finished, you get a summary of the 'TA review' forms that the students filled in.

You don't get -- AFAIK, no-one has (this is still true as of Fall 2013) -- a background of what the average responses are in our department, or for that class, if it's been given before. Your summary should include your own statistics, however. 

If you care about this, you may be interested to know:

• Having benchmarks (i.e. the averages in the department) are really useful for job applications. This is something that other departments at Berkeley do provide.