YMMV on the luck part. There's no luck involved after the cards are dealt and the round starts. Poker has that ugly habit of handing out huge swings in the last moment of the game; catch a lucky river card and a totally misplayed hand can turn into gold. Skat lacks the whole bluffing aspect of poker, so it's harder for a good player to force a bad player into bad decisions, but I would say that you're less depended on your luck in skat compared to poker.