I would think letting companies get away with this type of thing would be more wrong. You can be sure Apple will not be making this mistake again if they lose more money than they saved by using low end plastic, it will also deter other companies from screwing their customers as well by cutting corners to increase their margins.
I'm not usually one to defend Apple if they do something stupid, but they never promised anyone scratch-resistance.
If this was another electronic company, I don't think there would have been a class action lawsuit. Over what? Whenever you don't like something, don't buy it again. There are a myriad of reasons not to buy a product again, and "prone to scratching" is one of them. If you buy a pair of shoes that aren't comfortable, and lots of people also don't find them comfortable, that company simply gets punished when it loses customers in the future (i.e. they don't have repeat buyers).
I switched from Adidas (uncomfortable) to New Balance (better) to Brooks.
I switch from Sony Ericsson (easy to scratch, joystick breaks) to Nokia (no issues).
I switch from iPods to Nokia 5800 (mobile phone...as mentioned above).
My parents switched from Volvo (worse) to Hyundai (better overall).
That's what normally happens. I switch because I'm a consumer. I switch because I can choose the best product offered in the market we're in.
There are simply far too many people who are too weak to just switch to a non-iPod. The alternatives aren't inferior. If you're the type of customer who's going to complain about a certain product, but would continue to buy the same product in the future, then I guess the class action lawsuit is OK. However, let me ask you: how does $25 ever compensate you for the scratched screen? $25 doesn't fix anything at all.
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Saying that, the only time I think it's necessary to have a class action lawsuit is when you're promised something in an advertisement, but don't get it. For example, the battery life of your laptop. If you can't get the same battery life under the usage patterns that they used to test the laptop, then I call BS on Apple (or anyone else). If there should be a class action lawsuit against Apple, this is one area where it would make sense.