It looks like the embargo on reviews for Mass Effect: Andromeda lifted earlier tonight. Both OpenCritic and Metacritic have their initial scores already in from a variety of outlets. At present, OpenCritic has Andromeda sitting at an average score of 75%. This is across all platforms.
Metacritic has the PC and PlayStation 4 versions of Andromeda at 73% while the Xbox One version somehow edges out an additional 3% to (currently) give it an average score of 76%.
In general...