It was alright, lots of "west side" not so much "story". I think it's safe to say that the most important part of a "love story" is the relationship between the characters who are in love. In WSS, an appropriate amount of TIME is spent with these characters, but there is virtually no "relationship" to speak of.
Tony and Maria meet at a dance and fall in love literally "at first sight". Every scene that follows of the two of them together involves declaring their undying love for one another, or lamenting that they belong to rival "gangs". That is pretty much the extent of their personalities.
This type of iconic, archetypal relationship strikes me as something that would be much more easily forgiven in a stage performance - stage acting relies much more on a live, interactive audience that will "fill in the blanks". With film I feel that the director is presenting a much more specific, and calculated vision to the audience - there is much less room for interpretation.
I think most audiences will still project personality onto Maria and Tony, but I see this as a failure of storytelling - The message of West Side Story is dependent entirely on the audience caring about Tony and Maria and the love they share, but the film makes no convincing argument for their personalities or their relationship.