This play's place in Shakespeare chronology (one of the early comedies; 1598, give or take) could account for its flaws; the very basic marriage plot and the lack of sympathy for the characters (especially the women) for instance. There is none of that guarded subversity that makes 'Twelfth Night' or even 'A Midsummer Night's Dream' (first performance 1600) so accomplished.
However, even in his early years, Shakespeare was still Shakespeare and by 1589 had already produced masterpieces such as 'Romeo and Juliet' and 'The Taming of the Shrew'. Therefore, there is no pretexting inexperience and youth, and I'll just have to live with the fact that there are ups and downs even in the writings of The Bard.
The storyline aside, this is still a brilliantly brilliant text, of course! The sexual double-entendre is so pervasive, you hardly even need to have studied Shakespeare writing to percieve it. (Though if you are interested, I heartliy recommend Kiernan's 'Filthy Shakespeare'!)
And, at the risk of repeating myself; Shakespeare is always Shakespeare.
On the introduction by one William Carroll : OK, no more no less.