I can't actually say I am a big Henty fan. I see the home-schoolers' point: His stories convey strong Christian values and masses of fascinating historical information. Set against the sort of PC drivel that makes up much of the "young teen" book market nowadays...they look pretty good.
However, there is one (for me) big drawback to Henty: He was a simply terrible writer. He has no ear for the rhythms of speech, and as Brooke points out in her article, he wrote in haste and didn't bother to edit. At one point in THE CARTHAGINIAN BOY, some people are -- I am not making this up -- precipitated over a precipice. The broader skills of a novelist are also absent. One never feels that Henty has much interest in his characters. Sometimes he just forgets about them for pages at a stretch and drones on about military deployments, diplomatic exchanges, or political squabbles in a dull schoolmasterly style -- not very captivating stuff, surely, for a modern teen. I never find myself caring much about a Henty character. If the author doesn't care, why should I?
One of our boys echoed this criticism: "He describes the camp, then the tents in the camp, then the material the tents are made of..."
We've read very little of Henty and have none of him on our list at this point. I have heard from a number of sources that a few of his books have an anti-Catholic bias. Whether or not this is so (and I have no firsthand knowledge that it is), I do suspect that the Victorian Protestant Christianity of the author is unlikely to be completely congenial to the Catholic worldview.
Still, many of the titles sound intriguing --- I will add some to my to-read list and see for myself.