My 4 favourite MWs are Saunders, GGG, Hopkins and Hagler. So decently as a collection but my number 1 (Saunders) gets mauled.
Unless there's a Middleweight with Bob Foster type power out there, a bout with Tiger is a long, frustrating night for any Middleweight in history, with the potential for havoc to be wreaked on them. Marvin Hagler - probably my favorite Middleweight - has the durability and the armory to edge Richard Ihetu, but not without great difficulty.
You think Duran would be able outlast 15 rounds with Tiger the same way he did with Hagler? Duran best options are on the inside, Tiger at middleweight lost to fighters on the outside with movement and jabbing such as Giardello and Griffith. Tiger handles Duran in my opinion. Duran doesn't have the power to threaten Tiger. Tiger would easily clean through Hagler's title run through including a slugfest vs Hearns who would learn to late that slugging with Tiger is a big NO-no! Ray Leonard of 87 would get a draw depending on ring size, Ray Leonard of young would win on points.