The AVB decision looks weird when you consider they are above United in the league, but if you're getting thumped 5-0 and 6-0 in close succession by your supposed rivals and losing 3-0 at home to West Ham then clearly something isn't right.
Clearly it was going to take a while for the team to gel, especially with the amount of overpaid players they brought in, but some performances have been genuinely appalling and the manager has to take responsibility for that.
The players yesterday looked like they weren't playing for him - they were down to 10 men but there was no effort to even look proud in defeat. They just limply surrendered to the inevitable and if that's what the coach is instilling in them perhaps he had to go.