Which console has improved the most since its launch?

[Reasonable]

360 console technically has improved the most as it's gone from having hardware issues to being solid (so far as I know). Not trying to troll here just how I see it as a pure electronic device.

PS3 technically has actually gone backwards a bit, losing BC, memory card slots, etc. although this has been offset with better electrical consumption and the like with the Slim so it kind of evens out IMO

Wii hasn't changed at all in a technical sense so far as I know.

PSN has improved more than Live I think, but then you'd expect that looking at where it started.

Both 360 and PS3 have seen huge jumps in games/libraries so I think that's pretty even.