Fair point about "don't watch if you don't like it"...however, there is something to be said about what one would like to see done if changes were to be made:
-Stop trying to do everything. In all honesty, NBC owns dozens of channels-from local new affiliates to national news channels (complete with business, politics, and whatnot) to entertainment channels. The Weather Channel should be just that...NBC's Weather Channel. People will turn to it for what it's named for....weather. They go to CNBC for business news, MSNBC for crackpots (political analysts), and NBC for the news, not to mention their local news channels.
-Stop dumbing down the weather. True, you will alienate many viewers if you go too in-depth, but please do not dumb the forecast down so badly that it's almost useless.
-Stop the hype. Every little storm system is not a national emergency. In my opinion, the more often you hype something up (and, more often than not, it disappoints), the less credible you are in the public's eye.
-Bring a unified look to everything. Pull your graphics department together and come up with one good-looking theme that you apply to every facet of the operation. 2 different types of LDLs on the Intellistar just looks weird, and the HD national feed looks entirely different. Tie the lower 3rds, map bars, segment intros ,etc. together into a theme.
-Bring a unified sound to everything. Production music is nice, but bring back a "signature" of sorts. It doesn't have to be the 4 note chime, but use something to tie things together and form a calling sign that people can relate to you whenever they hear it. These last two are something that's known in marketing as "brand identification"
Just my $0.02