I say riding to work is great. If you are out of shape does not matter. Just start! Ride a day then take a few days off. Do this again until you build your strength.
Riding a few days ago and a storm hit. Even with the few times like that I say it is a great way to commute. I ride 12 miles each way and I was hitting 300 lbs. and now I am at 250 lbs over about 5 months. Feels great to be out from the office.