I think people do that hrminer because to them, the various flaws when added together are fatal to them. Everyone has that balance of the various shortcomings compared to the benefit of WebOS and everyone's point of balance is different.
Also, part of it is just how humans in general view things. Like it or not, "standard" and "Default" and "top end" are things that do exist in the mind of the buying public. The TouchPad doesn't exist in a bubble, it exists within the tablet market of July 2011. If you match most of the competition on hardware things and just leave software to talk about, software becomes the 100% focus because there's nothing to talk about with hardware. However, if you don't match the competition on hardware suddenly the conversation is split 50/50 between the two. For example, battery life isn't a big discussion point in reviews because its comparable with all the others. If it was significantly better or worse it'd get more attention. Since its neither, it free's up more time for talk of other things.
Right now, people disappointed in the touchpad seem to be in two separate camps (That do have some cross over). Those upset about software issues (no text editing, possible lag and freezes, lack of "basic" apps, etc) and those upset with hardware issues (bigger then every other 10" tablet on the market, plastic material compared to the metallic Xoom/iPad/Tab, lack of rear camera, etc). I honestly think if one or the other was less of an issue...IE if the software felt more like a polished 2nd gen OS rather than clunky in a similar way Honeycomb felt at first or the hardware was comparable to the iPad2/Tab10"...that you'd see a lot more focus on the good.
There's a lot of good there, and especially unique good. Touchstone and Exhibition! The slidable panels. At least some gesture support. Beats audio. The various phone pairing features. The amazing notification and multitasking system. The fact it does have more apps at launch then Honeycomb had.
But because there's significant issues for at least a fair amount of people (I don't think you take critics for gospel, but i also don't think you completely write off all of them) in both software and hardware when compared to the competition that it reduces the time to focus on them.
Let me give an analogy. Lets say most cars have remote door unlockers. Some high end cars come with a engine starter. So then you write a review about a car that doesn't have either, it just has a key that you can use to unlock the door, but it charges the same as the high end car. Now, does anyone really need a door unlocker? Sure its nice, but its not like you can't just walk the extra few feet and stick the key in. The thing is though, the unlockers have became standard and on high end things the engine start is beginning to become that way too. So its not unexpected when the reviewer takes time out to talk about the key...even though its not THAT big of a deal.
That's kind of the issue here, and I think that's why you have some people perhaps seeming predisposed. Because there's some basic things that seem almost standard in the tablet market in July 2011 that are simply not even present in the TouchPad...and it creates a very much headscratching response, especially in those who really did want to see the device be their next or new tablet purchase.