I agree... somewhat. As long as the machine does what its supposed to do - yes. But if you are fighting your machine it can make what you are doing much harder. The parts that made your machine are much less important than how that machine was made to operate.

Take a machine that does what its supposed to with good needles etc - and of course you can do a good tattoo, if you have the skill. But I also agree that you don't need a $600 machine. A very talented artist I know uses stealth knocks offs he gets for 70 bucks and gets great results.