Sanga woudn't have been a successful batsman (relatively, with good home stats and **** SC stats) as he is if he played for SAF or Australia, because spinners would have homed on him very heavily. His reduced ability to play spin does get lost among the plethora of SL batsmen who take on spinners. If Sanga played for India, would have been still more successful, because Indian batsmen are the best against spin (even tail enders!), and there will be less pressure on him. To Sanga's credit, he has improved his spin play, and sticks at it.
Mathews also from the same clan. mercurial against pace and bounce, OK with pace and movement, but very un-SC like when it comes to handleing spin. He's a good batsman, so he'd pick spinners off the pitch and play late, and if he finds out there's nothing fancy about the spinner will use the long handle. But with Ajmal and Afridi (and perhaps Ashwin), who has variations of spin, will tie down Mathews. On other hand, I expect him to do well against Vettori or Ojha (who mainly use changes of flight and pace), because he picks the length early. Swann will be somewhere in between, as his modus operandi is variations of flight and pace, does possess a straight on ball which is very effective due to massive spin he imparts.
So yes, spinners who have doosras, carom balls and googlies will tie down Mathews, but I expect others to be taken to the cleaners if used at the death.