Could anyone recommend some critics who have written about Rosencrantz and Guildenstern?
I've had a look for you and I've found a few things: see the links below. As Rosencrantz and Guildenstern are reasonably minor characters in the play, they haven't received a huge amount of critical attention.
There are two basic camps: one who believe that Rosencrantz and Guildenstern are spineless cowards, called to the court by Claudius and willing to do anything they are told to do, even if it means Hamlet's death. The other see Rosencrantz and Guildenstern as innocents, drawn into a complicated political situation which they do not fully understand, who cannot be blamed for the consequences of what they do.
Famously, of course, Tom Stoppard (who you might use as a critic - it's certainly an interesting interpretation of the play) seems to base his play "Rosencrantz and Guildenstern are Dead" on the idea that Shakespeare treats the two unjustly.
I found a link to one essay that might help you. You will find the link below and thank you for using eNotes!