What facts and tests do your base you opinion on?
And I think everyone should also remember that the M1 is not just a "US" MBT anymore. Egypt, Saudi Arabia, Kuwait and Australia also utilize the M1.
So the "Well most of Europe uses the Leo 2" isn't a valid proxy anymore. Has the US hasn't offered the M1 to any European countries for export.
And I am sure that the Leo 2 has had it amount of obstacles to over come, all tanks have there issues, none are perfect. The M1 wasn't built as an export model, so it's easy of use wasn't made to be user friendly to someone without certain training.
And I am still wondering how the M1 is not a reliable machine?
Yes we have offered M1 series to European countries, Greece, Spain and Sweden have tested the M1A2 for possible purchase.