I'll grant that this is not the fault of the iPad Mini itself. I blame web standards and browsers for not requiring all parts of a page to scale linearly and re-flow cleanly. It is (in theory) a problem solvable entirely by software. However, the reality of the web is what it is. If you don't have perfect eyesight, it's better to buy a large iPad with the same resolution as the Mini, and then everything is nice and legible. It's a shame because I love the portability of the Mini.
If you ever find a solution, please, let us know! Thanks!