I think a lot of people are ignoring MS. It does seem more like an I'll judged emotional outburst than a reasoned reaction. The competition authority in the UK is well respected so their conclusion is going to be given great weight by the EU and the US. Given the EUs track record, they're likely to be stricter than the UK, so the CMA adjudication is a good forward indicator that the deal is basically dead.
The CMA tends to be the strictest of the bunch (the same pretty much goes for all UK regulators e.g. compare the FCA to the likes of BaFin) their policy focuses on prevention not management and they tend to forecast further into the future than their European or American counterparts and most importantly they aren’t looking only at issues that can emerge within their respective market but any market that could have impact on the UK down the line.