I'd have an easier time if the clues and the answers weren't so ambiguous! I hate it when they combine two words into one answer, or use some outdated word that nobody under the age of 55 would know!
I do them when I feel like it... which is basically never. I'm ok at them I guess, I'll get maybe half of the answers before I give up. That's on a good day, although most of the time I feel like doing them are on "good days"
Crossword puzzles take too long, especially if you mess up one important answer and you get stumped by the boxes around you due to the invalid word configurations.
I much prefer the jumbles. They aren't so open-ended and they don't require obscure knowledge.