It's the same with us. He cleans the main room well, a bit caotically but in the end the floor is quite clean. If it doesn't manage to get into the other rooms (most of the time it does), I just grab it and put it in the side rooms and it cleans those too. I am happy with my Roomba and for the price it does a really good job.

I live in a 3.5 room flat (105m2) and the Roomba has its station in the living room (60m2 in total with corridor). It cleans this room really well every day. The other rooms only by chance.