There is nothing you can do tactically if the players you're up against are much better and believe more than your set of players. Fergie was never judged on his tactically ability against the likes of Barcelona or Real Madrid, I don't see why we should now start judging Solskjaer against his players being able to contain possibly the greatest footballer of all time and try to win the game.
This season is anything but a failure, and thanks to him. When he took over we weren't even dreaming about 4th place, now we have a very real chance of finishing 3rd if we get our shit together for the run in. Not winning the CL or the FA cup in your first 4 months in charge of a football club as interim manager is not a disgrace or a failure at all, managing a team for 5 years and saying 'cups are for egos' or being 3 point within first place all season to find yourself closer to 5th come the last 8 games is a failure.
There's nothing we can do about City or Liverpool. They've been building on each seasons success and we've been sabotaging our own with poor recruitment of players and staff. We can't judge our manager on what trophies they win, what fecked up logic is that? Considering it all happened before Solskjær even took the job.