Any opinions on Ocean City, MD for a family vacation?

We are considering a summer vacation there for the first time. It looks to me like there is plenty for a family with a 4 y/o to do, but my husband is skeptical. I would love to hear personal opinions and experiences.

We have gone to Myrtle Beach and it seems similar only cleaner (?) and more family oriented. Has anyone been to both OC and MB and can offer a comparison?