Ladies and gentlemen, this discussion is all well and good, but if you want the situation to change, then you need to get active...
I asked a producer at SKY why Andrew was commentating, listing the reasons I thought he was sub-standard, and the response was "we don't get much negative feedback about Dewey"... therefore, that suggests that lots of the complaints being made here are not being channeled through to SKY (phone, email, whatever means available)... SKY are most likely going to dismiss comments on a forum as a valid source of feedback, but complaints made straight to them are logged and passed on to the relevant people... if there are enough coming through, then people higher up the food chain begin asking questions...
The production team at SKY are very loyal to the people they use - hence why people like Andrew and Fred are still there, and people like Mark Elrick were on screen for so long in previous years... they are unlikely to make any changes unless there is a genuine reason/pressure to do so... therefore, you need to get active...
Personal insults or stylistic issues will generally be ignored... but things like bias, lack of subject knowledge, or obvious deficiencies in preparation and research are fundamentals in this line of work, and therefore likely to register if raised.
Something else to consider - Andrew, Fred and Heremaia are all Auckland-based, and therefore flown down to Wellington for every match... perhaps a local alternative (such as Jason Pine), or employing a single commentator from Australia (such as Cockerill) makes for a better economic argument for SKY's money men... just a thought...
Get active :)