They'll lose some/most of the carbonation.  It depends on how long it's left sealed and melted before being opened how much it will lose.  If you thaw out those beers and open them the same day, it'll be mostly flat, but should otherwise taste like... flat beer.

So, being lazy today, i thought to grab a frozen meal from the freezer, and discovered that some moron had placed a six-pack of beer in there.

it's been there for a couple of weeks; i recognize them, they are mine (an uncommon brand), and they disappeared from my fridge during a party. Somebody must have wanted them colder than i prefer, put them in there, and forgot about it.

We are talking beer-filled aluminium ice cubes here. 5.5%.

If i thaw them out, are they any good, or are they foul-tasting Soft Drinks now?

Is frozen beer any good?