Uhm...unless you noticed, I've went well out of my way to acquire every item in game that can help turning, sans Mod 9 with the new Radiant set.
And for every example you gave, it was a much higher Cleric Level than quest level that you said turning works, and you also left out the difficulty level.
Another item, when you turn undead, you still get hit 3 times since undead still get to finish their attack queues. So, try standing around a few Mage Skellies, cast Turn Undead, get lighting bolted to death, and then see the skellies run away in fear from your corpse.
The truth is, and I agree, you have to truly invest in Turn Undead for it to work. I mean feats, enhancements, items, build, etc.
To get those, that's a huge investment in Feats and Enhancements that really limit what you can do elsewhere.
So, bump up the higher end enhancements even more, so if a cleric does decide to go down that path, then Turn Undead for his level, and similar quest levels pays off.