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Hi Sasup.
A 6" reflector is plenty big enough to see detail on the planets. Not only planets though - you will easily see some incredible deep space objects such as bright globular clusters, open clusters, nebulas and bright galaxies.
Having said that, a newtonian needs to be loved. To be loved means, you need to collimate it. If you haven't learn collimation yet, please don't be scared. It's important to know the light path through your telescope and ensure that all the mirrors line up properly. That's all collimation is. A bit of tweaking of the mirror angles to ensure the view is sharp and crisp. If you collimation is off, your views will always be slightly blurry or soft.
Secondly, what time were you viewing Jupiter (it was Jupiter you were looking at I assume - a very bright star in the East)? It rises before 9pm but don't start viewing it until after 10pm when it's over 30deg in the sky. Even higher if you've got the patience to wait.
The higher it is, the less atmosphere you're looking through and the better the views will be.
Thirdly, we have a jetstream right over us in Sydney at the moment - that means there's high-speed high-altitude winds roaring up in the atmosphere that does terrible things to the light as it comes down into your telescope. It robs all detail and you end up with a blurry, wobbly mess.
Keep asking questions and learn more about your scope and the sky - and things will improve.
Also, if you can make it, on May 19th we're having a viewing night at Kulnura on the Central Coast (near Gosford). There'll be small and large (up to 20"!!!) telescopes there. You will see some AMAZING things, and we can help you out with your scope (collimation!) if it needs it.
Hope i've helped.
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