First of all, the texts are graduate texts indeed. So if you haven't had any previous exposure to a topic treated in a volume I wouldn't really recommend it. The point is that a lot of the math is not explained, so if you don't understand the math you will not learn it from these books.
Second, the books are indeed good. I, personnally, came along a lot of (technical) subtleties that are usually skipped over in other books, but are treated in 2-3 sentences. Having said that, keep in mind that the books are fairly old so some stuff is indeed missing that can be found in any standard modern texts (e.g. the book on Q.E.D. is all about a quantum gauge theory, but a lot of the results are not applicable to non-Abelian gauge theories at all).
I haven't read all of the books (far from it), but the one I can really, really recommend is volume 1, Mechanics. It's an absolute gem and should be accessible for a third year student.