Alright Worf!! For all of your talk about honor and responsibility, when your son becomes an annoyance and gets too hard to deal with you ship him off and forget about him for years, til he shows up on DS9. I find that incredibly irresponsible and it seems to completely go against his character.
And whatever happened to that kid that Worf bonded with after the kid's mother died? They were supposed to be "like brothers" and that kid is never seen or heard from again either.
Worf was my favorite TNG character when the series aired. I liked him in DS9 also, but I have to admit as I watched it (recently), I completely forgot about Alexander.
I hadn't noticed before the soap-opera like time warping of Alexander. They accelerated his aging dramatically, with no explanation. His "canon" birthdate is in 2366; he is then serving with Worf in the Dominion War in 2374 at the chronological age of 11.
So it seems Alexander's age got distorted by 8-10 years. Of all the shows not to explain something like that, Star Trek is the most unforgivable!
It would also help to explain some of Alexander's difficulties in DS9: he literally hasn't had a chance to grow up.
As to Worf's honor in raising his Son, I can see those points. When Worf gets his spine replaced (In "Ethics"), he tells Troi he couldn't send Alexander home as his human parents were too old to raise Alexander. It ends up making a nice emotional foreshadowing of the relationship with Troi, but also underscores Worf's fumbling to make the best decisions.
However, I don't see this as a failing of Worf's honor. Worf is fairly archetypal in this sense, moreso than many Klingons in fact. I see him more fairly as struggling to make the better choices, and sometimes failing.
I used to hate the Alexander character, originally, but now I like him. His character often hits an emotional chord we otherwise wouldn't have.