I don't use Reason, but I tried it once back with version 2. What I think you have to do is fuck with the patterns (1-8) in Redrum. Then you mix each of those patterns up in the sequencer, taking certain patterns out/in to create variations. That's basically the same idea as Fruity Loop's step sequencer, except you can see the whole thing. You should be able to trigger sounds via midi as well through the piano roll, like C5 - C=Kick, D=Snare, E=HiHat, F=OpenHat,etc.... That's the most realistic you can get because you ain't limited to a certain space, 16steps. Not sure how that would work with the Redrum though, but I'm sure it's possible.
Anyways, I wouldn't buy into this whole "I wanna step my game up, so I got Reason instead of Fruity Loops." That whole mentality is BS. What it all comes down to is TALENT and the quality of sounds you choose to use. FL Studio is perfectly capable. Just DON'T use the sounds it comes with. Their both sick programs, I just wouldn't call FL trash. There's just too many misconceptions about it because so many damn people use it and because of the "Fruity" name. It's small in size, easy to download, easy to make instant music. Of course there's going to be millions of people using it and within those millions you have a higher chance of hearing shitty music being made, see YOUTUBE videos. If Reason was 100megs in size also, I guarantee you'll see a lot of crappy music floating around being made with Reason as well.