This is becoming a rather heated, if a bit pointless discussion, guys, no??!?
The M1 is obviously a formidable machine, maybe, the best. Nationalistic pride apart, let's remember that the M1, the T-80, the T-90, the Merkava, the Challenger and the Leclerc have never faced 'contemporary' opposition and that comparative judging must be difficult, at best. There are many other MBTs, present or past, that have had the same 'blood anf guts-less' history and that did not mean they were bad designs...
Who could say that the Saab Draken and Saab Viggen were bad aircrafts..?? It is widely thought that they were amongst the best aircraft of their times, if not the best. Yet they were never used in anger, and their crew never went to war. But the Swedes were ready for it.
Also consider how some of those machines have been sold to many countries while others have not. The Leopard, in its various guises, is still used throughout the world, and knowing German products' reputation, must have been and must still be a decent machine.
I'm glad most of those machines were never used in anger, I wish it will stay that way.
Domi