My husband has committments a few times a week at night, but because I get home at 7, he has to take care of our child for 2 hours a day between daycare and when I get home. That's a good balance.
Getting to that point was hard in the beginning (when she was 3 months old) because he didn't think he knew how to take care of her on her own, and basically was forced to do it because of our schedule. It's easier for men to let the woman be in charge, but if at all possible you need him to be able to take care of the baby on his own by himself without you at home.
Now that my child is 2, he tells ME when i'm "doing something wrong", and we're equal parent partners. I'm not sure if his parenting is an issue, or just his attendance at home. If he is a stellar dad and goes off a few times a week, you might want to start making plans yourself even once a week so you don't feel as slighted (gym, walk, friends).
Reality check - if you separate, he would be getting visitation with the baby, on his own, for days at a time. He needs to suck it up and play equal partner NOW while you are under the same roof. If he doesn't already know how to be a daddy and mommy all at once, he needs to learn.
I'm not sure how old you are, but many guys do not want to give up their freedom, it's much worse when you are younger parents. One piece of advice that my Mom gave to me (wise woman who married at 21 with 5 kids) is NEVER do everything yourself, he has to contribute.
You have to be able to look yourself in the eye in the mirror and honestly say you've tried everything with your husband before calling it quits. Definitely try counseling first, you owe it to your baby to try everything before splitting up the family.
good luck!