Some recentish reviews of Flash issues found around the web:

Flash vol.1: Move Forward (HC)

• Move Forward at Collected Editions
• Rob Patey: Flash Batters Barry’s Boredom

Flash #13

• Retcon Punch
• CBR
• My Humble Review
• Comic Vine
• Population Go
• Culture Cast

Flash #14

• Comic Book and Movie Reviews
• Culture Cast
• Comic Vine
• Silver Snail
• CBR
• Den of Geek

Other

• That F’ing Monkey reviews the New 52 Flash (part 1) and part 2
• Atop the Fourth Wall: Flash Comics #1