The Xoom was half-baked and lacklustre, and no other tablet has been widely available for a reasonable amount of time.
That's all there is to it.
I absolutely disagree with that statement. Yes, it may have been half-baked and lacklustre, but that's not all there is to it. I think he makes a very good point in the article that the attitude of a lot of non-Apple fanboys is "why use one of these tablets, which are glorified smartphones with a big screen, when I could use a real computer?" He's right that while those users really like their Android phones, that an Android tablet may not be adopted due to laptops and, to some extent, netbooks, out-competing them.
This is of course anecdotal, but I firmly fall into that category. I have no desire to pay 600 or more dollars for a keyboardless toy. Because that really is what these tablets are. They do lightweight web surfing, lightweight games, and that's pretty much it. I'm not going to sit and write reports, code, play real games, etc, using one of those. I am open to tablet sized devices, but only if they do something really different than what my laptop can do. For example, I own a kindle because the e-ink screen is dramatically better for reading than any LCD based option. Everything about it is purpose built to excel at reading, and it does. But an iPad? Other than booting quickly it does nothing my laptop can't do, and there is much my laptop can do that it can't (and for quick booting and light web surfing in a pinch, I have my Android phone).
The other comment I'll add is this: He says in the article that there are a few Windows tablet fanboys. I guess count me as one of them, because I do love a Windows 7 convertible tablet (with a keyboard). It eats the iPad for lunch. It runs real, full featured programs... any Windows program I want. In college, I can fold it flat, hold the stylus and write on the screen just like I would a piece of paper. Microsoft OneNote's handwriting search is just about perfect... I can find any note I ever took, even in my own handwriting, in less than a second. And I can take engineering notes... just try doing that with any other device, whether the iPad or normal laptop... there are so many special symbols you'll never be able to. And the screen is multitouch (and this tablet is a few years old). Yes, the iPhone is cheaper (but much less powerful), lighter, and can boot faster, and I don't deny that. But that's what my Android smartphone is for, and when I want a real tablet to do real things with, I pick Windows 7.