I tend to agree with this. The name itself will be the reason darkcoin is never widely accepted by, er, "normal" people (also can't think of the right word sorry). It doesn't matter how great it is, give it a shady or evil sounding name and it's doomed.
Not that I condone criminal activity, but to be honest, that is how bitcoins gained some traction. I don't think any rational person will see the name darkcoin and say, oh, I can't use that, as it's an evil coin used for bad things. If so, they wouldn't use bitcoins or any currency either. It's not like someone made a coin called devilcoin (although give them time, they are sort of running out of names)....
Bitcoin - litecoin - darkcoin ... has a nice ring to it, and perhaps darkcoin becomes the copper to litecoin's silver. Although litecoin isn't doing particularly well either lately.
Let the tech speak for itself. The statement "silver to bitcoin's gold" is a marketing gimmick and a complete joke. It has nothing to do with what ltc offers other than total supply but that is not really relevant because BTC divisibility (physical item comparison is irrelevant) and flood of scrypt coins.