Hearthpwn

Looks cool and playable - keep

Playable or looks cool - probably keep

Neither -dust

Also tend to raise the bar when rotations happen - since I'm rarely going to play the cards anymore, I'll dust the extra golden ones.  And lower the bar for things that generate other cards.  

All of that really applies to opened golden cards.  I'll maybe craft one golden legendary per set, but I can't really bring myself to craft non-legendaries in gold.  The legendary cost (twice regular amount) seems ok, but when you get down to 400 for a golden common it comes time to cut yourself off.

I personally love the animations and everything, that's why I wasted 3,200 dust at the start of un'goro making a golden elise. The lich king looks great as well. But crafting non-legendary cards is a waste and ridiculous. Correct me if I'm wrong, but crafting a golden RARE costs 800 dust. 8x the original value. The crafting cost needs to be lowered for all non-legendary cards.

I love them but I'm mostly f2p so I dust most of em. I keep golden Classic Cards that are playable and usually most playable from the current set but if I need dust I don't hesitate to DE them (even though it does hurt me every time)