That ... depends.
First of all, its silly to talk about 'skill' in a plain video game where 'skill' is about 60 % internet connection, and maybe 30 % autisticly pushing buttons and only 10 % experience and reading your opponent (to foresee what he will do as his next step and use it against him).
Next, native and crpg are very different, almost two completely different games now.
But, its not native or crpg players, many play both.
The stereotype crpg player (hiding in heavy armor, using s-key (and sometimes e) and spamming a polearm or two-hander would probably do good in a public native death match, but would be practically useless in a serious match on the top level.
To sum it up, average skill level in crpg is higher, but the top level in native is a different world.
Its just different.
Tactical level is definately higher in native,
also, you cant stand on s-key and stay out of reach,
you need some good blocking skills,
and, most important, you need to be a master of shield when you want to be a warrior.