Three sisters is an amazing play. Although plot-wise there is not so much going on, language-wise and artistically this is superb. Čechov had this incredible talent to depict his contemporary every-day life in a way, that it still seems contemporary nowadays (if you overlook the carriages and letter writing, for instance). But the basic human interaction and our failing in being able to communicate with each other is still the same and I haven’t found any other dramatist who could depict it as accurately and as funny as Čechov did.
But the most amazing feature of his plays is, that every time, I read them, I find some new facet, which I haven’t noticed before.