Druids are one of my fav classes in IWD2. The reason others might not like them is because they are clerics and mages in one class but can't fill the role as well as those two classes.
Keeping a druid single class helps them get the most out of their spells and they can switch between healing, evocation and transmutation spells depending what the situation calls for. It's worth nothing that if you are going to be using evocation magic at all, or be using your druid in a support role, then it's best to keep them single class.
However, 4 Fighter / X druid is also a stellar build but this role shifts from support to front line damage dealer. This character will ignore evocation spells entirely and focus on transmutation spells (or act as a back up healer). Most of the important druid transmutation spells effectiveness doesn't increase with additional druid levels which makes this an excellent build if you want a front liner who can also use magic without it being weaker from the lack of caster levels. This druid build will have a slightly weaker call lightning / static charge, however, as awesome as those spells are, they are not reliable as a primary damage source so i believe the trade off for weapon specialization is worth it. Barkskin unfortunately will always be a level behind a single class druid until about the end of the game which is a shame but a front liner that can buff themselves with generic AC is awesome.
I have used both builds in a few playthroughs so I can vouch for their usefulness. Give the druid a chance, they aren't a bad class at all. As kmonster said, definitely take one if you're using a 6 man party.
Post edited November 13, 2015 by IwubCheeze