Kangaroos would be as dangerous as bears.
http://www.outback-australia-travel-secrets.com/kangaroo-facts.html
The Red Kangaroo is the largest living marsupial and can grow to two metres (!). It weighs up to 90 kg (200 pounds).
Top speed: over 60 km/h (close to 40 mph). A Red Kangaroo can leap eight metres far (25 feet) and three metres (10 feet) high!
(If it wants to. At normal hopping speed they would cover more like 1.5 - 2 metres or 5 - 6 feet in a leap, at a speed of about 25 km/h or 15 mph.)
Male kangaroos "box", either in play, when asserting their dominance or in serious competition over females. The punching of the front legs is pretty harmless, but the powerful hind legs with their long sharp toenails are a dangerous weapon. Kangaroos can disembowel opponents, be it other kangaroos or predators like dogs.
Essentially a Kangaroos kick can kill you and you can't outrun one.