If you really want to learn more, visit the SimhHQ forums and place a post in the IL-2 Forum saying something improbable like "The FW190 rolls slower than an Ercoupe" and then sit back and watch the fur fly. You'll rapidly be buried in performance data charts
In general, roll rate is affected by aircraft weight, wingspan (shorter spans roll faster), overall stability and aileron authority (which isn't just a function of aileron size, but also how light on the controls the ailerons are). Note that aileron response can vary considerably with airspeed and altitude. Many aircraft were notorious for being difficult to manuever at high speeds (like the Zero, depite its agility, and the 109) because stick forces became so heavy.
The Fw190 rolled faster than a dachshund falling down an alpine ski slope, while the Spitfire banked more slowly. (Relatively speaking, anyway. For example, I once met a Mig-21 pilot who had flown a Mustang, and he commented on how pokey the P-51's roll rate was. Most pilots wouldn't describe a P-51's roll rate as leisurely, so it's definitely relative to what you know)
Flying technique also can make a big difference.
Anyway, the simmers are fanatics about such information, and thus are a great source.
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