The twilight fortress 3x map has FFA settings. Its layout has 2 very close bases. So games on this map always starts with 2 1v1s then the 2 winners facing off after.
It turns out to be easier than 1v1 for some reason. On cheating AI, it appears impossible unless you go for immediate military buildings, and its still not beatable by me.
Do the other FFA maps with 3 AIs also tend to have 2 close AIs attack each other, while the other AI focuses on player? My vote is that this pattern makes the game more interesting if FFA AIs would pair off like this.
Indeed it is interesting since we only have FFA atm and this map is made to be a 2v2 team battle. Interesting enough this is the first map I played SC2 on and while having no idea what to build I soon found that I was next to an AI who was sending a very large army at me! :D