That's a disappointing result... but not nearly as bad as MKR which came in fifth, after ABC and SBS on just 402,000. Ouch.
FWIW, last year Survivor's third ep came in at 562k as well, but as the season unrolled it turned out to be the highest rating season they've made so you never know.
Difference is Survivor is going up against MAFS. Anyone could see that it was going to rate low this time around. Same with DWTS on Sunday.