yeah, Coleman is extremely weak, and also, Luminara is quite strong, as is Depa. I don't know as much as I would like to about Piell, but I am pretty sure he would loose to them, Coleman is a non-factor in this.
Oh, one word of advice, I know that you are new, but please do not go around making lots of threads right away. Some of them have been done before, so it is always good to use the search button. You seem to be a decent guy, but following those general guidelines (and the rules that are posted, they are really good, please read and try your best to follow) will gain you respect. Basically, try to be respectful and treat others like you would like to be treated, even if you disagree with them, just post reasons for your thoughts, do not just post insults about a person. Actually that reminds me, when you post, please use logic and facts, this will make life here generally easier and gain you respect. Anyway, I know that this is a lot to remember, but please try