Here are my 2 cents on Moras:
1. They cut quite nicely. They come sharp, stay sharp at least fairly well, and the shape is very practical, in terms of applying force to the part of the blade that's doing the cutting. They will, indeed, cut most of what most of us need to cut in an outdoor (or even indoor) situation. Try peeling and dicing a potato with a Mora and with, say, a military-style Ka-Bar, and the benefits of the Mora's shape will demonstrate themselves readily. Also, as mentioned above, wives are quite happy to use them in the kitchen--for the same reason. The plastic-handled ones can even be run through a dishwasher.
2. Inexpensiveness means a couple of additional things: (a) you can actually afford to use and test the blade you are planning to take into the wild, and if you happen to buy the one knife that snaps like a pencil, you can find that out before you have to rely on it too much. I wonder how many buyers of $50-$500 knives feel free to really pound on them (well, maybe not quite pound--but put them to very hard but not unreasonable use) before taking them into the field. I don't hear too much about people batonning with Ontario Bagwell blades, for example. I'd be scared even to try, if I owned one.
(b) Inexpensiveness also means you can buy a bunch of them and leave them around so that you're likelier actually to have a knife when you need it, than if what you've got is one expensive blade. You can keep a Mora in your belt survival kit, another in your glove compartment, two in your backpack, another in your office desk drawer, another in your trunk, etc., etc. The weight is so light that I would almost never hesitate to carry an extra. So, let's say you break one batonning through wood--I imagine it's harder to accidentally break 4 $10 Moras than 1 $40 whatever-else-I-might-carry. Also, you can afford to keep a few around for other people to use. Often when I'm out and about, I find that I'm the only guy who had the foresight to bring any gear along, which means that I'm the one supplying everybody in sight with water, food, warm hats, etc. Not bad to have some extra pass-around, loan-them-out (or even trade them for something) pieces of cutlery around in the car, etc., just in case.
Though I'm in agreement with those who'd like to see the tangs go farther into the handle on the plastic (and Eriksson wooden) handles than they do, that plastic is so tough that I'm not too concerned about the possibility of a blade breaking loose. I figure that if I'm going to snap a Mora, it's going to be at the blade/tang junction, or else halfway up the blade--so it's not going to be the part that's back in the handle that I'm going to have to worry about.