My favorite, I think, is number five:
Fifth, while it's useful to compare and contrast the traditional Roman Mass with Paul VI's version and with the various Eastern Liturgies, it is obnoxious to make disparaging comments about any of them. The excellence of one or another of these Liturgies doesn't require anyone to criticize the rest.
Too many discussions of the mass today revolve around a 'my mass is better than your mass' sort of attitude, which do nothing but promote division and inferiority complexes all 'round. While we needn't relapse into a liturgical latitudinarianism and pronounce all elements of all liturgies inherently equal, it also bears keeping in mind that a certain rite which drives you crazy might be the rite which gives the lady sitting next to you ecstatic transports of celestial glory.