DPS is damage per second. The first tick of incineration is large, hence the quick cast of incinerate will result in a large amount of damage at the cost of a short cast. I haven't played wizard since April but at that time incinerate was very high on my cast priority. I believe I have previously posted my entire cast priority charts from 1 - 8 targets so I wont bother repeating it. If your only basing your cast priority on tooltip values, your doing it wrong. I didn't change from wiz to warlock because I was having trouble parsing... The damage output potential of warlock is just so much higher than wizard, it was too much to pass up.