ORIGINAL: Ur_Vile_WEdge
It helps, but it's hardly a sure thing. The Bulgarians have no HQ, and if you haven't aligned or conquered Yugoslavia (which makes the whole exercise moot) it's hard to get a German HQ there.
Which means the Bulgarians are limited, once they penetrate a bit, to sticking near Salonica and relying on an Italian convoy to stay in supply. If Italy hasn't had generous aid from Germany, which isn't really possible if they only got into the war post fall of France, then a gang of British carriers operating in the 4 box of the Eastern Med can make it hard for those CP to survive.
Even if the British can't send any reinforcements, you've got the 2 Greek initial units, and then the mil that will be coming next turn, as well as a garrison the turn after if you're playing CBVs. And a MTN on the resource, the inf starting in Athens and then moving either to hex 2414 or 2413 depending on how the Axis maneuver, or if necessary bringing the MTN back to cover both if you have both a fast column coming down from Albania and a Bulgarian contingent.
It won't hold forever, but it will stall, or force the Axis to try a risky attack against dug in guys in the mountains.
And if Italy only joined the war in say, J/A, I just don't see how it works. Did the Germans have units sitting in Bavaria and Austria, ready to walk into Trieste and be shipped to Albania right that turn? If not, you probably won't have that many units, or if you do, they'll be the Italians themselves. And Italy only has 1 unit that can move 4, so their advance through the hills is going to be slow, even with no resistance whatsoever.
Edit: One thing I am assuming is that even if the British don't have any transports/bodies to send to help the Greeks out, they do have enough of a naval presence to put pressure on the Eastern Med, make that convoy keeping things in supply a risky venture. This might or might not be the case in an actual game. If the British are staying out of the med, an attack on Greece is enormously simplified.
Italy has had more production than it gets normally but way far from 100% of the factories, but it's main builds (almost exclusive) were FTRs and NAVs, plus repair or 2nd round SCSs.
Last turn (surprise against CW) I sent 2 CV and 2 battleships to the repair pool. Bad luck I had 4 X and all of them were saved and only got D.
The British fleet was divided, part of it having had to deal with the Kriegsmarine raids (all the same I repaired and second round), so they are based in Portsmouth, too far to be a problem by now, the transports, 2 of them about Southern Africa in their way to Egypt, and most of the other in few convenient locations.
Id say I have advantage in the Med Seas because with my 2 /3 navs + plenty of fighters, one ranged 6. He has no fighters except for an interceptor in Gibraltar, and he has only a 20 range naval there too with few naval points (1 or 2).
The Italian Fleet can more or less deal with his forces if necessary. We are not using the rule that there needs to be a convoy to supply so anyway I can try to sneak a crappy cruiser to supply the forces...
As for those units, I rely a lot in the Luftwaffe, which has some good units in Italy along with Italian bombers.
Yes, the Germans were in Bavaria, in the mountains, railed previous turn, since one of them was an HQ and it Works as a train station, they just walked to Venice.
And yes, my only concern are the British but they don't seem to be able to send corps or at least more tan 1 or 2 corps, hopefully none.