I disagree. I hope Trump does not use Mark Steyn as a speech writer, unless only after some editing. Steyn is great at problem analysis, but usually tries to illustrate his points through sarcasm and droll humor.
Mark spends too much time weaving elaborate jokes then laughing at those jokes. He seems at times to be overly impressed with his ability to turn a phrase.
When he’s substituting for Rush, this tendency plus his Welsh accent can render Mark unlistenable for me.
It's why Coulter can't be taken seriously, and that's a great, great shame and waste of talent. Her books are better at controlling the sarcasm and snark, Demonic: How the Liberal Mob Is Endangering America being the best.