I'd skip DHS. It's my least favorite park.
Remember, though, that you wouldn't be going to Universal Studios (unless you bought the Universal version of a park hopper), you'd be going to Universal Islands of Adventure.
I like DHS, and it would pain me to skip it, but I had way more fun at IOA. In addition to seeing the WWOHP (which I consider a must for HP fans), I loved the Jurassic Park section, the splash rides and the thrill rides.