Hm, I can never decide on my favourite flat ride. I've got a soft-spot for Rush, it's got a great sense of speed and on the one swing you get some brilliant air-time, but on the other you get some gentle floaty airtime. Then you have Maelstrom, which gives a more intense and exciting ride, I absolutely love Maelstrom, if anything it's the main reason (apart from Apocalypse) I visit Drayton Manor.
Bling doesn't do much for me, I consider it the tamest of the flat rides I've been on, you get some good height but compared to compact Top Scan models Bling pales in overall intensity. I found myself resting my head against the restraints, it can be fun, but hardly thrilling.
Ripsaw is commonly slated, but I find it a great flat ride. It might just be because of the park, it's a great break from all of the coaster-whoring around Alton and when it wants, can be quite a headrush.
Enterprise's are utter turd, and so is Submission.
Oh did I forget to mention Venom at WMSP, that is without a doubt THE BEST DROP TOWER IN THE COUNTRY! :--D