One of the sport leagues around here always starts off the year with a challenge pattern to get everyone back in the groove so I'll share my insight.
Personally, I think they are easier than a house shot when bowling good. You never get the over/under. When you miss right, you don't hit the face. The carry is much better because you don't have quite as big of an ocean in the middle of the lane.
When bowling bad, it can be a little more difficult. The ball actually goes where you throw it.
There are always a handful of bowlers in the league that average 230+ the first 8 weeks...