@Attila Kovacs - If you find something truly horrendous, feel free to send me a link. I am not going over the 12K posts by hand, though.
Edit: But not yet, do it after I've done the brush ups that Google+Exporter are implementing.
I'll announce it when I think it is "done".
Besides, Tags existing in the original G+ posts are perpetuated.
Post category is also attributed as a tag.
Also, the blog search is full Google search, so you can write things like
someword AND (thisword OR thatword)
Note the capitalization of logical keywords.
Hence the titles are the least of worries.