OP: You should mention Fallout 3, as well.
It has 23 quests. And that is counting each uniquely named leg of a single quest line as a single quest, as well as all the the unlabeled ones.
You sure about that? Just counting the main quests and side quests only on this page shows more than 23.
http://fallout.wikia.com/wiki/Fallout_3_quests
Most of the side quests in Fallout 3 are far more lengthy and detailed that those in Skyrim. e.g. The wasteland survival guide, reilly's rangers, etc. One of these is probably equal to four or five side quests in Skyrim. And almost every main quests in Fallout 3 would actually ask you to do something, in contrary to Skyrim's "go from point A to point B" and that's a quest.
Not to mention those unmarked quests(most are equal to skyrim's side quests or even more) and repeatable quests(similar to radiant quests' base quests).
Of course this doesn't mean Fallout 3 has more quests than Skyrim. After all the focuses of these two games are different.
Just want to say bashing game without regarding to the fact(which in this case the fact is quite obvious) won't get you anywhere.