The phrase "a good marketer" is correct and usable in written English.
You can use it to describe someone who is skilled or effective in marketing practices.
Example: "In today's competitive market, being a good marketer is essential for the success of any business."
Alternatives: "an effective marketer" or "a skilled marketer."
"It's always easier being a good advertiser, a good marketer, when you have good products," he added, laughing.
"I was never that much of a fan of Mickey and all, but I thought that Walt was a good marketer, a smart man," Will said.
After more than two decades of running Home Depot, Mr. Blank had a good feel for the qualities that make someone a good marketer.
Martin Motes, another prize-winning vanda grower who lives a few miles away, calls him "a good marketer and an incredible salesman," but adds that Mr. Fuchs is "a very dominant personality who can be relentless and needs to have absolute control".
A good marketer obsesses over messaging, writing, branding, SEO, SEM, analytics, etc.
With women delivering half-truths in research sessions, how's a good marketer to find out what she really means and what she truly needs?
In 2009, seeking to marry the brand to a brick-and-mortar business, he considered founding a pizza restaurant ("I'm also a dough-slapper") before building what was then Brooklyn's only cigar lounge — and he worked "Brooklyn" into the name, as any good marketer would.
Good marketer Salman Rushdie ‚àí Turned a weakness into a strength, limiting negative brand effect of personal ugliness by going into hiding.
Good marketer Lenin ‚àí Had a slogan which consisted of one-word sentences ("Land. Bread. Peace").
If a good database marketer was involved, then I'd expect them to have a precise subset of customers they deem worthy of free T-Mobile money.
Andreas Weigend, a former chief scientist at Amazon who now teaches data mining at Stanford, lets out one little secret: The difference between a good online marketer and a great one is not in the algorithms, which are getting to be well known, but in the richness of the data fed into them.
