I don't think it's worth $60/£40, but that's just me. I'm pretty skint, so I guess it changes my point of view; if you have the money spare, go for it, but in my case I have waaay less than £40 and I need a new phone, so I'll wait until later in the year and hope it's price has gone down.
I'll pay maximum of £20 for it.
I don't care how good it is, if it's only really good for 2 campaigns that are the exact same each time, I'm not prepared to pay that much.
I've learnt my lesson from Bulletstorm, and will now only pay £40 for games that are replayable, and have multiple modes.
That's mainly due to how much money I can get in a year, however.
When I'm older and have a proper income, I'll be getting more games with spare money.