My husband is a great dad... when he has to/wants to be.
Basically, as long as I'm around, being a mommy and taking care of both of them, he is pretty lazy. But when I'm out, or at work, or away for any reason, my husband is a great daddy.
Hmmm... so even though that really does annoy me, I sort of know how to handle it with my husband. I go out. :) I'll go to the grocery store, or go work out. Maybe I just go out for a walk, or hang out the laundry, etc. But I make sure that I leave my son with daddy. Once he is in charge, and I'm not around, he is great.
Now this isn't the perfect scenario, and we're working on that... but it was a first step. Now at least when I talk about the problem with him, he can see it first hand, because he knows that he just relies on me if I'm there... instead of sharing in the duty and fun.
Also, keep in mind, that if he is working 2 jobs (my husband works over 60 hours a week) by the weekend, he is just really really tired, and he just needs to relax. So maybe work out a plan where he does have a couple of hours Saturday morning, or Sunday evening when he can just do his own thing... but that is a trade off for him being more involved the rest of the weekend.
Good luck!