As a graduate student in English Literature I can tell you exactly where I stand on the subject. Whether Shakespeare wrote all of the plays that have been attributed to him does not matter to me.
The text speaks for itself. The author's name could be unknown. The only way that this could alter the way we view his works is that had Shakespeare as a name not been attributed to these plays, the works might not have been as canonized as they are right now.
Yet, the works themselves stand on their own, they're brilliant.
The author could be called: Poohcarrot and it still wouldn't matter. When you read a work, the text should stand on its own. Far too much emphasis is placed on the author and their 'intentions'. Unless the author is in front of you, it is very difficult to determine their intentions and as such the works have to speak for themselves and we (the reader) bring context to the text.
Cheers.

