I started this thread a couple of weeks ago on World War map. It's my first time using allies for a large map (but played smaller maps with them) so asked for some tips and advice.
I have tried out your advice and this is what I found:
In the Air;
Most of you suggested Tactical Bombers (and having used them a lot in the past, I was happy to oblige). I have produced them in bulk (forming 10% to 25% of my army). Because of their long range, they have been great at destroying enemies when working in a stack. Especially since the allies are particularly slow moving! I have used them as the first offensive, before my land units arrive and that has worked great.
Some of you also suggested adding Interceptors to the air force stack. I found these to be more of a nuisance than a benefit. Their short range cannot keep up with the tactical bombers meaning you lose the advantage of the long range and you also have to build twice as many airstrips.
On Land;
Tanks: I started by producing lots of light tanks (as they are the fastest tanks). This worked well, as long as you make sure to keep the tanks up to date with research.
I generally avoided medium and heavy tanks and quickly found the ones I did produce just could not keep up with the rest of the army. They have been useful to be left to defend key positions but they should not be expected to lead any attacks.
Infantry: As you guys recommended that I avoid regular infantry, I only produced a handful of units. These worked fine at the beginning of the game as you don't need to travel huge distances. However, as soon as it was possible, I started mass producing Mechanized Infantry. Having the same sort of speed as the light tanks, they worked great together, as they could relatively quickly cover expanses of land.
Ordnance: I discovered that the Mechanized Infantry and light tank combo is great, but is vulnerable to airstrikes and struggled against stacks of heavy tanks. To prevent this, I found that adding 1 SP Anti-Air and 1 Tank Destroyer to the stack solved the problem.
TIP: Always keep the SP Anti-Air and Tank Destroyer as highly upgraded as possible. Otherwise they will slow down your stack!
A lot of you suggested using a lot of Artillery. Despite having produced a two dozen level 3 SP Artillery. I have found that they really slow you down as you have to wait for them to slowly disintegrate the enemy. The combo Mechanized Infantry and light tank work fine without them. The only advantage I can see of them is if you are attacking a large stack, but in these situations, I found that tactical bombers can easily do the job (and they are much quicker to move around).
On the Sea;
You guys all agree that the Allies doctrine is good for building a large Navy and it is!
In this game, I used mainly a combination of Battleship stacks and Submarine wolfpacks. I won't go on about it too much but this has worked great.
TIP: if you are building up your Navy, or simply conquering overseas, max out your Transport Ships! It is really worth it!
Conclusion:
I suggest using Tactical Bombers. They are the allies best friend. Make sure to always build airstrips on newly conquered ground to keep those bombers always on the offensive. Interceptors are not that useful.
On land, use stacks of light tanks and mechanized infantry. Sprinkle in a high level SP Anti-Air and Tank Destroyer too.
Artillery could be useful, depending on your playing style (blitzkrieg style players should avoid them).