You have to take into consideration that these tanks were design during the cold war era; they would maximize the frontal protection versus side and rear. Nothing wrong with than until you face an asymmetrical threat were you need 360 protection. The Leo 2 has a very high ballistic protection against kinetic projectiles such as sabot rounds, less against chemical projectile like the RPGs, nevertheless a top of the line design and a very reliable mechanic.
As for the MG-3, we rented those tanks, now we own them. The Germans made a deal with us, they are taking the 20 2A6 we bought from the Netherland in replacement minus the EMES 15, PERY 17 sights and the power packs. The CDN wants to replace the MG-3, not because there is anything wrong with them, it's just a question of standardization.
I was talking to my friend who came back from there as 2A6 loader, the major issue with MG-3 is the mount in the turret and the non-disintegrating belts, they have a different spacing than our C-6, it make them incompatible with our guns. In other words, if you take a C-6 belt, it would work for 2 to 3 rounds in an MG-3 before you get a stoppage.