Pink Poncho turned out bad

I finished the pink poncho.It turned out very very bad looking.I am not sure what went wrong.I'ts big enough for a 300 pound woman. I think I will use that yarn in the bad looking poncho for leftover yarn. Every time I make a poncho it either turns out small or too big or not folded right.I think I will give up trying to loom ponchos. It's takes too long anyway.