In the sort of weather we've been getting of late, unless you pitch the angles very carefully you'll either up end with rain collecting on top and stretching the thin fabric with it's weight, or if it's angled down too much the wind will buffet it like a sail.
Once the rain has (too easily) stretched it, you have a flappy thing that makes noise in any wind and it is impossible to make taut again.
We've had to use heavy duty pegs (not supplied) and axtra poles with extra guy ropes (not supplied) lashed diagonally across the top to prevent it lifting off in high gusting winds
If looks weren't a factor a regular cheap diy store plastic green tarp is far better in poor weather conditions.
The quechua has guys on all four corners and one in the middle on top, plus two guys half way along two opposite sides, but really to be fully functional (what would it have taken Quechua?) it needs guys at the midway point on all four sides.
Great tarp for fair weather poseurs. (only joking)