Okay, APC on armour maps is an invaluable piece of armour, and, for me, works best as either solo or double in it. As you say, it is very effective as anti infantry (which there are many to be found even on more armour intensive maps) but the APC is also extremely effective as anti armour.

First, it is quick and agile and will out manouevre walkers and tanks. It is more sturdy than a tank and will always require at least 2 shots (tank, pilum etc) to take out, so you have good chance to get away even if you take damage and also manage to avoid bits of the map which glue themselves to you.

For me, the biggest plus about this vehicle is it ability EMP enemy armour and gunships. If you run solo APC, you can approach a tank, maybe take a shot or two, EMP it, drive behind it, jump out, and Pilum it from behind for instant death, jump back in APC and if driver bails, well, eat rain of death. This is very effective tactic and with two people in APC you can sync your shots to kill armour from distance, both tanks and APCs. Walkers often take a bit more work but with your faster vehicle and EMP you can take these out too.

The APC provides excellent suppressive fire on armour maps, and many flags do not give defending players much armour (think of dry lake on 64 player suez). The other 4-5 guys defending that are going to be on the ground. The APC can make very light work of these whilst squaring up to the tank so it can only get front shots and bombing the infantry with ease. When they spawn in and go for you again, you can rinse and repeat.

Another point, if you EMP an enemy piece of armour and they use their shield after your EMP has hit them, the shield will NOT work and your shots will go through it. You can use this tactic to help your other pieces of armour take it out with ease as it is undefended and cannot move.

For me, the APC is in no way a 6-man transport vehicle. If you are moving from one place to another, you want your SL in a buggy or catching a lift on his own, with the squad ready to squadbomb on him at the opportune moment. Of course, you can use the APC as a transport, particularly when you have just grabbed a flag and want to move elsewhere, but I don't really think there is an argument to see this thing as solely for 6man transportation.

If there is only one APC available, you want a dedicated squad that uses it as a killing machine, not transportation. For me, it should be run with either one, two or at the very very most, three people inside it. If a squad needs to get somewhere with it (such as using the pods on Belgrade), you only need the SL to be in at and when he gets away from it, then the squad spawns in. Generally, like the 6 man rofl, it is too many tickets to lose when the armour dies if it's full.