It has always seemed to me that the type of striking that works well in MMA (in most situations) is the more explosive striking. Where in Muay Thai/KB, you can have more accumulative attacks.

This is why I think some Kickboxers can make the jump to MMA and some have trouble with it. CroCop's style was always explosive, and he seriously trained his takedown defense, so he was able to compete well in MMA. I think Anderson Silva and Machida's styles works well in MMA. Both fighters are highly accurate and are great with timing. Fedor is always explosive with his strikes.

This isn't to say accumulative striking can't work in MMA. Kenny Florian tends to do this. BJ Penn used it very well against Diego Sanchez. I think it's the fighters with very confident takedown defense that can do it. I'm guessing we'll start to see more of this in the future and the sport evolves.