Hmmm....I don't who "they" is, but I'm a latakia hound who dislikes most Syrian blends....
This is terribly subjective, of course. And the question isn't made any easier by the fact that there are probably hundreds of such blends....
The Frog Morton series is very popular, especially for smokers who are just starting out on latakia. McClelland also makes Wilderness, Legends, and Three Oaks Syrian, all of which are top-notch mixtures (if exceedingly mild).
I would say, however, that most of the "top shelf" blends are by either GL Pease or Dunhill. I've tried most of the offerings from both of them, and I can't say that I'm very fond of Dunhill's products (hence I won't venture to give you any recommendations). I am a big fan of Pease's stuff, however, so I'll recommend what I think are his best blends:
Odyssey
Maltese Falcon
Chelsea Morning
Sextant
I would also highly, HIGHLY recommend a blend called "Northwoods" from Boswell. It's a spectacular smoke, and is good for both beginners and more experienced smokers.
Also, Hearth and Home makes at least two awesome latakia mixtures: "Larry's Blend" and "Fusilier's Ration."
There is also a large genre of so-called "American English" or "crossover" latakia blends. These tend to be a little lighter on the latakia and use burley in place of virginia as a base tobacco. Morley's Best, Epiphany, Walnut, Old Hollywood, and Countryside are some of the better examples.
I hope this helps!