I'm skeptical of various parts of AGW (e.g., Climategate) but I believe the reaction to the field has become a hate death spiral. (Hence, considering it in its separate parts rather than a single phenomenon.)
Accordingly, I find some of your reasons unconvincing.
Building on the above point, if half of contemporary research results are wrong, then the likelihood that the complex multipart AGW argument is wrong is very high.
Fully general counterargument.
Climate scientists have never made a public falsifiable prediction.
Regarding the confirmation of the second and third assessments (that is, they failed to be falsified, which implies that they were in fact falsifiable):
"Comparing climate projections to observations up to 2011"
In conclusion, the rise in CO2 concentration and global temperature has continued to closely match the projections over the past five years, while sea level continues to rise faster than anticipated.
You don't find any falsifiable predictions if you never look for them.
Sorry, I don't have time to dig through the mound of literature. Could you please just state what the falsifiable prediction is? Please be as precise as possible.
Note: Please see this post of mine for more on the project, my sources, and potential sources for bias.
I have written a couple of blog posts on my understanding of climate forecasting, climate change, and the Anthropogenic Global Warming (AGW) hypothesis (here and here). I also laid down the sources I was using to inform myself here.
I think one question that a number of readers may have had is: given my lack of knowledge (and unwillingness to undertake extensive study) of the subject, why am I investigating it at all, rather than relying on the expert consensus, as documented by the IPCC that, even if we're not sure is correct, is still the best bet humanity has for getting things right? I intend to elaborate on the reasons for taking a closer look at the matter, while still refraining from making the study of atmospheric science a full-time goal, in a future post.
Right now, I'm curious to hear how you formed your views on climate change. In particular, I'm interested in answers to questions such as these (not necessarily answers to all of them, or even to only these questions).