To be honest, their criticism of Bruno's performance in that game is very well justified because both Keane and Neville were long time serving captains of United and did their jobs exceedingly well, Keane for 8 years and Neville for 5 years so as past captains both are in a very very good position to judge and therefore be critical of the clubs captain on the day. It is good that both of them are complaining and continue to complain about the clubs 'on the day' captain's behavior because it needs to be known that such behavior and performance is totally unacceptable for a captain of Manchester United whether it be for just one game, a couple of games for a whole season.
As I mentioned in another post of mine, the FA cup round against West Ham, United are there for the taking and oh boy did Liverpool do just that. Even though United won the game they played poorly and it took 2 very very late goals for United to win. as others pointed out as well, if West Ham had taken their chances the result would have been much much different. Credit to Liverpool's coaching team for doing their homework on that game because they exposed United's shortcomings in every quarter.
Could Betis do the same, we will have to wait and see.