Just the leveraged ones. The daily rebalancing grinds these down over time. The higher the volatility, the worse it is.

However, there is an additional problem for most of commodity based ETFs (leveraged & unleveraged). They buy futures contracts which have to be rolled over, usually at extra cost leading to even greater losses over time. The unleveraged versions that hold the physical commodity (such as GLD) are safer - they track the commodity quite well.

I have no problem with ETFs in general, but if you plan to hold them for any length of time, you should know what's in them & how they operate.