When it comes to Lesnar it's hard to get a good assesment of his skills.
Some people just assume he is a fantastic MMA wrestler but what we have seen so far doesn't prove that. His shots haven't looked amazing in MMA. They've been solid but not great.
His striking has a lot of power but his techinique isn't good yet. His grappling has a lot of control but his submission defense is going to need work.
Also his knowledge of submissions is dreadful. He went for 2 submissions against Herring one was a terrible guillotine, and one was a RNC without the hooks in.
Lesnar has some good wrestling, and power but that's about it he will get better though.