Russell is a charlatan in general I would never recommend that a beginner read his works.
They could be classics for bad reasons. Why are they classics? Because they are read a lot? That would not be a useful criteria in judging what is worth reading. (Circular even, in a sense.) I never wrote or implied they were randomly selected.
I'm aware that people will read the classics in a higher philosophy education. That does not imply that they are worth reading/should be preferred over other books.
What do you think it means to say that some book(s) is "foundational"?
While we're at it. Start reading logic. Anyone who wants to reason about anything seriously need to learn logic.
Maybe some of the more hardened academics here will disagree with this, but I think that the book Plato and a Platypus walk into a bar would make a very good, very light, entertaining overview for someone just interested in the basics of philosophy mixed into a fun read. This book could also work quite well for a high school philosophy class, if combined with proper instruction.
I don't think anyone should suffer through reading the entirety of one of Aristotle's translated works, i.e. Politics or Nicomachean Ethics, much less someone who is just starting a study of philosophy! Seriously, just get the cliffs notes when it comes to Aristotle...the complete historical perspective is unnecessary, and the arguments lose nothing when written in a condensed and much more readable form.
Sein und Zeit - Martin Heidegger
To some extent I agree, especially when we talk about his Politics. But I would never recommend the Cliff Notes or Spark Notes to anyone, for any book. Instead of those inane summaries, a scholarly companion to the text would be a great idea.
When it comes to his Ethics, though, I'd hardly call reading the entire text suffering. It's not very long, nor is it the most challenging work around, you know? That particular work, as opposed to his Politics, is already relatively condensed. If the student does not have a teacher or tutor for Ethics, go ahead and read the whole thing - it certainly won't hurt.