I have never been there should I go

Yes, you should most definitely go. It's best to go to both parks, Universal Studios and Islands of Adventure, and take the Hogwarts Express back and forth between them. If you stay at one of the on-site hotels your room key doubles as 1 hour early park admission to Harry Potter World and a fast pass for all the rides and attractions at both parks.

Yes

You'll like it I've been going for 22 yrs and I have an annual pass

Like universal

Yes definitely

Obviously, you must go

Yes you should. It's good place for a vacation