The point at which the third season ended, it looked liked this season and this particular episode was gonna be a lot more exciting one. But really this episode crashed my expectations. It was a particularly dull one. Ted was boring as usual. He looks pathetic when he is single, but he looks way more pathetic when he is in a relationship.
But that's not why I didn't rate this episode high. I thought that the real attraction of this episode will be Barney-Robin relationship. But the attitude of Barney even while considering his Daddy role, was way more cavalier. As his character, the casual feelings he has for Robin look artificial. With feelings, its like you have it or not. You don't go around being a Barney and being in love at the same time. That's why the directors are trying to show and it sucks.
The only part which I enjoyed a bit was with Robin getting over with her job and its ridiculousness.