My experience with Google Plus is also like my experience with Google Wave but in a different way -- I think the service is very cool but the "slow trickle" invite system is making it mostly useless to me (what's the point of a social network when hardly anyone you know in real life is on it?).

If this plays out like Wave, by the time a critical mass of people I'm interested in interacting with are on the service I'll have lost interest.