We are HUGE Disney fans also and tried Universal/IOA for the first time this August. We even bought their FL resident annual passes (a steal at $139).
PROS:
-Citywalk (we like it better than downtown disney)
-Thrill rides (our teens loved these)
-Harry Potter (not big fans, but still very cool)
- Nicely themed
CONS:
- No magic
- Lack of customer service (several issues)
- Themed rides just don't draw you in like at WDW
- No magic
We did enjoy our time at Universal, but the whole time my husband and son kept saying "it's just not Disney". My teenage son loved the thrill rides, but I was surprised to hear him say that he likes WDW so much more. That really warmed my heart as a mother seeing that even as a teenager, he truly feels the magic.