some issues needing to be answered first (and some comments as well)
Not everything does what it says it did. That's the problem.
The AIfocus for instance is broken. It does not do what it is
supposed to do. It is supposed to start tracking a moving subject
automatically, and otherwise work like one shot focus. But it is
broken. It often starts tracking when there is no moving target.
Are you sure you have not moved the camera to trigger the servo mode in the AIfocus? Only when you can REPRODUCIBLE demonstrate the camera fixed firmly to one place (e.g. on a tripod) to start servo mode with totally fixed stationary subject, you have ground to say the camera has errors. I more suspect here user error than camera error.
Canon can either fix this or provide a workaround (manual switching
between focus modes). The Nikon upgrade has an auto focus
improvement. Why can Canon not come out with one? Lots of people
complain about AF inaccuracy with wide angle lenses (different
lenses, Canon and others). I'm sure this could be addressed in a
firmware update. The better P&S cameras do not seem to have such AF
problems at the wide angle.
A lot of noise I admit, but very rarely anything you can say for sure is camera generic error. If your AF is totally out of the spec, then you need to get your camera calibrated to function correctly. I have seen much more reports of no AF problems than those of AF problems (including those from myself), so I assume the camera to work generally OK, but there are sure some problem units.
What comes to Nikon "AF fix", I have understood it is more to improve (speed up?) the continuous tracking. I do not know is this falls into cathegory of error fix or performance improvement.
The fact (???) that some P&S perform better is not a proof that Canon has an error needing to be corrected in 300D.
People have also complained a lot about the flash exposure being
incorrect. I'm not saying Canon should add FEC. I'm saying they
should bring out some fix for the flash exposure problem. I don't
care what that fix is as long as it works. The better P&S camera's
have a flash system that works better.
The questionactually is, that are the flash shots radically wrong or if this is more a questions that they to dot match someones personal taste. I have seen newer an example where a flash shot is either more or less completely burned out or (almost) totally black.
Here again, the fact (???) that some P&S perform better is not a proof that Canon has an error needing to be corrected in 300D.
People have also complained about blurred tripod pictures with long
lenses, with exposures under one second. A good P&S camera does not
have this problem. I'm not saying "Canon must enable MLU". I'm only
saying the camera has a bug and it needs to be fixed. I don't care
whether the fix is called MLU or something else.
MLU is not in the spec of 300D, so that's that. P&S'es do not have mirror, SLR does. So you can expect when you buy the camera the "mirror slam" to have some effect.
Many people (including me) who bought the DR used a P&S camera
before, without the AF, flash and blur problems we see in the DR.
Us plain consumers consider the DR to have bugs that need to be
fixed.
So did I, and have had no problem with my 300D nor with my current 350D either. Quite many times I have seen there is a significant learning curve
I'm not asking for a new engine. I'm asking for bug fixes and I
don't care how the bugs are fixed, as long as they are. I have
got a bit of experience after one year with the DR, so I do know
about the AF modes (which the DR doesn't have but doesn't work
properly without) and I do know about FEC (which the DR doesn't
have but which would offer a manual solution for the flash bug) and
I do know about MLU (which the DR doesn't have but appears to need
to avoid blur). But as a consumer I'm not telling Canon how to
solve the bugs. I'm just asking that they do, because a good P&S
camera does not appear to have these bugs.
As far as I see, your "errors" are not anything that can be considered to be "out of specification" i.e. any real error Canon must correct. If the unit is falty, like it has serious AF or flash exposure error, it must be sent to service - no FW update can help these cases.