Fowler is not good. Tanev is good, Trouba is good. I don't see a comparison here. Fowler is a decent bottom paring d-man who can score on PP the other two are very top-4 d-men with Trouba having the potential to be a #1
You may not like or want Fowler, but giving a poor evaluation is a bit much. Fowler is a top 4 D at the very least.