I've found Nazi (Or at least German) fanboys have pretty much ruined my enjoyment of WW2 wargaming in general. Hell most any discussion about WW2 tends to be ruined for me as soon as people start raving on about how Germany was light years ahead of everyone and their legions of uberpanzers would have rolled over everyone had Hitler ordered them to lose or some silly crap like that. I recognise the Germans built some pretty out there stuff, but the fanboyism really annoys the hell out of me.
Also my only realy human opponent for a long while in CM was a Nazi (Or at least German) fanboy. Not so much a problem at first since i'm not a fan of playing as the germans, but every single battle i fought was a battle against a King Tiger, Panther, Tiger or some combination of the three, usually accompanied by an elite SS platoon and perhaps an MG42 or two. Against my usual force of a rifle company + supporting medium tanks. I can't say my force selection was always historically accurate or anything, but honestly after facing uber tank after uber tank where my own Shermans/T-34s felt useless i just kinda got bored of CM. Ironicly of course i won most of the battles, in CMBO i would always eventually ambush his ubertank with bazooka teams, and in CMBB with 57mm AT guns (Thanks to JasonC's advice) But it was incredibly repeitative. Worse still, anyone he introduced to the game would inevitably listen to his advice (Or my whining about invulnerable front armour) and take the same uber armour.
So I stopped playing. I still find CM to be the best game out there in terms of wargaming on the PC, but honestly I'm really bloody sick of worrying whether my gunners will hit the bloody thing, or whether my gunners will be lucky enough to receive tungsten ammo.