If you're hoping to see the critical reception of Borderlands 3 before you commit to a purchase, you're going to be pretty limited prior to launch.
Publisher 2K has only sent early code to a select number of US outlets, citing security concerns. The publisher appears to be on edge after sending private investigators to a prominent Borderlands 3 leaker's home.
It's disappointing from our perspective, since we've attended preview events for the game both overseas and in the UK. During these events, we were privy to some content that we couldn't yet talk about due to signed NDAs. Because that's how NDAs work – we sign them and we're bound by the terms. Now we haven't signed one for review, if any leaks do happen, we're good to report on them. It seems counterproductive if the goal here is added security.
More: https://www.vg247.com/2019/09/08/borderlands-3-review-no-early-code/