It's quite true, and there are a lot of them.
Serbian Chess Players at Chess.com

ive played people from other countries and the hardest to me are canadians and russians. (for online)

yes,Serbians are quite strong and underrated.when a serbian accepts my seek,I know I'm in for a fight.and Phillipines too...they're quite tactical and love unorthodox openings.

Pozdrav svima , napravili smo novu grupu "Serbian chess team" pa molim sve aktivne srbe da pristupe. Grupa iako ima trenutno malo clanova (ali iskusnih) igra konstantno turnire (4. trenutno). Admin i ostali clanovi su aktivni i cilj nam je da zajedno pobedjujemo ,da komentarisemo meceve i da unapredjujemo znanje. Serbian chess team je osnovan pre 2 dana.
Serbian chess players in Chess.com have a pretty nice playing style, would you agree?