Yea this. Meeting the mother is the premise, but really it's not the point of the show. It's essentially a context to be able to tell all these stories. The show isn't about meeting the mother at all, just a group of 30 somethings hanging in NY.
If you're watching the show to find out who the mother is, you're really doing it wrong. lt's not a mystery or a serial show, it's a sitcom and most of the episodes are pretty standalone.