Sounds a lot like recency bias to me. The whole forum was giddy about the possibilities of an interchangeable front three when rashford, martial and lingard were playing well to start solskjær's tenure. Now that they have had a dip in form we find things to criticize. The fact is that Lukaku has had more than a season worth of consistent game time to improve but he's been more or less the same player he was at everton. Rashford and martial have been dicked around every which way to accommodate zlatan, Lukaku and sanchez until now when they are getting a consistent opportunity to show their level. They might not be the answer but I'd much rather make that decision with adequate information and playing time.