Ranking are just a measuring stick. I just (personally) dont think that is a strong trio. They will be ok, but as the strength of your team, dont see that happening. The fun thing about fantasy football is taking chances on players, but that doesnt make them good, time will only tell. Peterson could turn out to be really good(again) but with an injury risk, I didnt think he was worth the risk.
The other two will have ok stats, but nothing special.