My views on this have changed somewhat since 2012! (When I last posted in this topic).
1. Nemesis - Brilliant coaster, very forceful and the surroundings compliment the ride experience. I find it very frustrating that they close off the back two rows when it rains (the best time to ride!)
2. The Swarm - I really like the ride, it has good pacing and seems to be picking up more force this season. Also, the theming is fantastic. However, I despise the backwards rows because they cause horrendous congestion with the queueline (main queue moves slower then it's all bunched up in the station), and also because they mean that I can't ride it in the back row properly. If they got rid of "Brave it Backwards" then I would prefer it to Nemesis.
3. Nemesis Inferno - I didn't used to rate this very highly but I'm sure it has picked up a serious amount of force over the last few years!
4. Oblivion - Really like the sensation of free-falling the drop has, but it's a shame that nothing else happens after it.
5. Air - Doesn't do much for me unless it's running particularly well, in which case I find it average at best. It just lacks any thrill, and it's supposed to be based around theming and landscaping but there isn't any!
It does however have the flying element which is the only reason I rate it at all.