Okay. Please put yourself in my shoes: I have never, as a player, been in any group that lasted longer than a year after I joined. (My current 5e group will cross that threshold in a few months, and I am still very grateful for the invitation to join it.) Almost none of the groups I've been a player in have had any players in common. I have been striving to find a long-running group to play with for a very long time, and I've seen many bad apples I've stayed far away from while looking for such a thing. That is part of why almost all of the DMs I've actually had have been at least pretty decent, and the majority have been quite good.
I have never had the luxury of relying on years of reputation. I have never been so fortunate as to have extensive experience with a DM before working with them. And this is going to be similar to the experience for most players today, because most players of D&D 5e (whether 5.0 or 5.5e) are brand-new to TTRPGs, if WotC's numbers are to be believed. As in, something like four to eight new players for every single person who had played a previous edition first.