As someone who writes for Packt (Posting under a throwaway for obvious reasons), I think you made the right decision. The first title I was proud of, had good editorial control and decent technical review. The second title had an awful premise that was insisted upon and stunningly poor editorial control. Disappointingly I now feel like I have to apologise for something that carries my name.

My next title will be self-published onto Github on a 'freemium' model. It'll allow me to develop the content in the open, and if people are so disposed, they can pay for an edition that carries additional explanatory text. Either way, I won't be writing for Packt again.