There are degrees of "unsuccessful/successful" though. Wii U may have be a failure, but to say its as big a failure as the Dreamcast is absurd.

Any console under 25 million is in the "big failure" pile. 

"Successful" is not a word that should be associated with the Sega Master System, Sega Saturn, Sega Dreamcast, Nintendo GameCube, Nintendo Wii U, Turbo Grafx 16, Jaguar, 3DO, etc. 

You can't really fault the Dreamcast for Sega's financial position, that was a result of damage done before the Dreamcast was ever born to boot. 

Again though, failure is a spectrum, not an absolute state.

For example, Gamecube and Virtual Boy were both failures yet one was clearly far less of a failure than the other.

How in the world can the 2600 be close to a failure? You cant ignore size of the market at a given time.

And why is 30 million the arbitrary number you landed on?

Anything that sells 90 million units is a success in this business. There's only like 3-4 other consoles total of like the 50+ that have been released that have sold that or better. Sony's electronics division force feeding Blu-Ray into the machine is on them, but the general public eventually embraced the machine very well as a gaming device.  

PS3 if anything probably shows how difficult it is to beat Sony in the console space ... even with almost everything going wrong for them at the start and disastrous early sales, they still basically end up selling the same/better as the 360 and Wii. 

Sorry, it's not a success when you lose billions of dollars.  At least the N64 was profitable and it outsold the genesis which you say is a success.

How much money did Sony lose on PS3? Like i said in my last post, there is far more than just units sold to make something successful.

I can sell 1 billion units of something but if i lose billions of dollars in the process than im not successful, on the other hand if i sell 1 million units of something and make a healthy profit than i am successful.

The only reason the PS3 lost money mainly was because of the Blu-Ray decision, which is a non-gaming issue that the main Sony Corp. forced onto the game division. The fact that it was still able to garner a huge userbase says a lot.

Sony, like them or not, simply know how to sell consoles, Nintendo and MS are way more hit and miss, Sega is more miss than hit. 

PS3 may have accrued a sizable userbase when all was said and done, but it lost Sony billions of dollars and still couldn't catch up to the Wii.
It's the lowest selling Playstation console, and the only one to lose its generation.

There's a reason Sony made PS4 nothing like PS3.

Wasnt the Cell processor also a big part of losses?