Haha this is my blog -- its pretty new. I agree it's readability is less than ideal -- going to change it at some point. HTTPS as well probably at some point. Its been an experiment for me doing everything by hand. The entire blog is a large single Rakefile using Markaby :)
Even just disabling CSS makes it readable. For HTTPS, I think that (like someone else mentioned) it should be made optional (at least for read-only access to public files) rather than mandatory.
For a random blog you have never visited before and have no reason to trust. It could attempt to do all the malicious things that you are worried a man in the middle would do.
The browser still has to execute code over HTTPS. You've just moved the injection perimeter from inside my own network into the providers website. I don't think you've fundamentally changed your level of risk unless you spend a huge amount of time browsing on shared password WPA protected wifi networks.
You cannot browse to sites under any regime and execute code while expecting security to exist.