Yes, absolutely never criticize - as a manager, the #1 thing that makes me start to hate a report is when they complain about other people's work. Most of the time they don't understand why code was written the way it was (Chesterton's fence), and even when they do and are making valid complaints it's just a dick move that doesn't help.

Trust me, the lead and manager both know when someone sucks, they don't need to hear more about it. And if you're wrong with your criticisms, you just demonstrate that you suck. Literally lose lose.