Dramas or plays as long as they stay in the print form remain a part of literature.
Both have strong rationalities to support the observations expressed, both are analytical, and both deal with the commendable as well as the blemishes of the production.
Basically a review is a subjective discourse hinting on the cultural and artistic significance of the production.
Theatre criticism, on the other hand, is a deep analytical discourse of the production against the backdrop of the theatre-arts as a whole.
Technicalities of the different aspects of the production are discussed in details together with exhaustive analysis of the rationalities of their execution.
Specialist media exists to cover most artistic disciplines, in this field one such publication is The Stage (see our theatre magazines category for more).