I actually think Roar is a good coaster if ridden in the back. Me and my friend who are both enthusiasts enjoyed our first ride on it in the back but then we rode it in the front and realized why people have low opinions on it.
If you ride in the back it's actually very smooth whereas in the front it's more stapled, rough and screechy.
I actually have Roar above HP's Wildcat, Mean Streak, Rolling Thunder, NE's Thunderbolt and Georgia Cyclone to name a few so I think the hate is a bit exaggerated.