Are hub gear equipped bikes any good?

It seems that while in theory they are good because they can shift while stationary,are more weatherproof than a derailleur system with exposed chain and cogs and maybe some other things.
I hear only things about skipping,grinding noises,fucked up hubs and other problems I don't know if hub gears are actually good.

Of course there's A LOT of different models from different manufacturers.

Are there any bad ones or good ones?

I'm looking at a bike with pic related.An alfine 8(but possibly and Alfine 11)hub if i'm feeling fancy