Don't think "the greatest" is what we should be hoping for in a goalie. You're also basing your assessment on some of the above from a handful of games, whereas you have years of hindsight to benefit previous managers.
We've seen what Marvin is capable of, and fletcher has been injured, then you can add skippy and Pearson who were instrumental in keeping us up and will be key this year. He signed straker and Taylor, who were awful, and Thomas who was a mistake. Clarkson was clearly signed as backup.
Baraclough couldn't do the job, but let's not exaggerate.