The new manager is never going to be a universally popular choice whoever it is, and to be honest a manager's previous history (good or bad) is not often much of an indicator as future success. Some managers are a good fit for certain clubs, but failures at others, only time will tell.
It is therefore important as fans that if it be Lampard, Bloomfield whoever that we give them a chance. Talk of boycotting because of MR's sacking, or because of the selection of a particular manager is ridiculous, and ultimately self-defeating if you want the best for the club (this is not a move to Northampton situation). I say that as someone who wanted MR to stay and have been disgusted by his sacking. At the end of the day though the football club must always come first.