I have been playing through a few MP games with a friend. Here is one of our observations:
If we consider the amount of ressources (metal, crystal) in a SP game as the normal amount, then in MP each player has access to only half the normal amount. In SP, I conquer a planet and get x ressources for the price of 20 AIP. In a MP game with two players we have to conquer two planets to get the same average amount of ressources (x) per player, but now it is costing us 40 AIP.
An example:
On an 80 planet map, SP mode, I normally take out around twenty planets before I go for the AIs home planets, in order to get a decent pool of ressources and knowledge points. The late game usually consists in taking out up to ten more planets, to get a clear road between the jump-off points for the final attacks. When I am ready for the end run, I have killed, say, 30 planets, having thus amassed 30x ressources and 60k knowledge points, at the cost of 600 AIP.
On the same map, MP mode, using the same basic strategy, we end up with 30x ressources and 60k knowledge points, for the price of 600 AIP, totals haven't changed. But the ressources are now divided between us, giving us 15 x each, unlike the knowledge points and the AIP, which is shared.
SP: 30 planets = (30x ressources + 60k knowledge + 600 AIP)/player
MP: 30 planets = (15x ressources + 60k knowledge + 600 AIP)/player
This is a huge reduction in ressources per player. Is this intended? If so, why?
Of course there is some synergy at work here, two cooperating players somehow perform better than the sum of two single players, and so the AI has to be correspondingly stronger to make up for this. But not that much stronger, in our opinion. In SP the scarcity of ressources are an important challenge among others, in MP it becomes the main pita, overshadowing all others, causing us to constantly sit and wait and wait and wait for ressources to build up. Pursuing the obvious alternative, ie. taking out more planets, leads to crazy AIP levels. We have temporarily overcome this problem by giving ourselves positive handicaps, but we can't help thinking that this 'solution' is a kind of cheating.