"They look ahead of the field right now. But things can change pretty quickly.
"They're fresh, they've rested guys at the right time that I know of.
"Defensively they are better than everyone else and attack-wise they've got people in good positions and they're scoring points every week."
Melbourne will face Parramatta at home on Saturday night, with the winner earning a spot in the preliminary finals.
The Sydney Roosters will host Brisbane in the other qualifying final on Friday, after they each chalked up round-26 wins over the Gold Coast and North Queensland respectively this weekend.
But Hasler also said only the fifth-placed Cronulla shaped as a big threat to Melbourne, after they wrapped up a home elimination final against the Cowboys with a 26-18 defeat of Newcastle on Sunday.
"Everyone is saying Storm, but I think there is a side that can beat the Storm, it's Cronulla," he said.
The Dragons should have joined their rivals in the playoffs, but let slip a 20-14 lead late against Canterbury at ANZ Stadium on Sunday afternoon.
It means they end their season in ninth, despite having led the competition after recording a 6-1 start to top the table after seven rounds.Manly and Penrith will face off in a grudge match in the other elimination final, after the Sea Eagles thumped the Panthers 28-12 on Saturday night.
With their season on the line, Manly shot out to a 28-0 lead to wrap up sixth spot, giving them hosting rights at Allianz Stadium next Saturday night.
Meanwhile the Wests Tigers ended their difficult season on a high on Sunday night, condemning the Warriors to a ninth straight loss with a 28-16 result in the final game of the regular season.
NRL Telstra Premiership Finals Series - Week 1
Qualifying Final: Friday, September 8, 9.55pm, Allianz Stadium
NRL: Sydney Roosters (2) v Brisbane Broncos (3)
Qualifying Final: Saturday, September 9, 6.10pm, AAMI Park
NRL: Melbourne Storm (1) v Parramatta Eels (4)
Elimination Final: Saturday, September 9, 9.40pm, Allianz Stadium
NRL: Manly-Warringah Sea Eagles (6) v Penrith Panthers (7)
Elimination Final: Sunday, September 10, 6.10pm, Allianz Stadium
NRL: Cronulla-Sutherland Sharks (5) v North Queensland Cowboys (8)