I was pleasantly surprised by how much I like Ibsen's plays (at least, those in this volume), although they are rather bleak. I didn't find them depressing or cautionary but rather just sort of nihilistic. I'm sure there are certain cautions we can read into these plays, lessons to be learned, but I don't think that's what Ibsen intended. I like what Forster had to say about him (from the criticism in the back of this volume)--that if his characters were ever happy or content, those things disappeared well before the curtain rose, and we see them in mid decay. Many tragedies begin in happiness and show the unraveling, the agnarosis. Ibsen starts already unraveled. There are elements of characters still clinging to ideals and happiness, but Ibsen the writer and we as his audience have already gone ahead, as if, without knowing the outcome, we do know what awaits them.
Ibsen's dialogue is very readable. It has only minor references to things outside of or before our modern understanding, with the possible exception of Peer Gynt, which is still very accessible.