Disagree with that @Grimbok. Whilst Dryad spam is probably best, there are plenty of players who have gone 3-2 or 4-1 with min model, monster heavy lists. @Jimbo did it at Angelcore and someone at Blackout this year went 4-1 with a non battalion list, featuring Alarielle, Drycha and Durthu! So definitely doable in casual play. I also think it's pretty impossible to assume to know how GW 'wanted' the army to play. There are a lot of players playing Sylvaneth, many of whom picked it up early on (myself included), so I don't think that it struggles in that respect.
My thoughts in general, if we were to get a new tome:
- Fix stringing. Yes it makes Dryads good, but it is silly. Not particularly fun to play against, and just doesn't make sense at all.
- Make woods consistent in manner they're put down. All outside of 1".
That would be my only two things that I felt really needed dealing with. Think the tome is relatively balanced.
Having said all that, definitely not in the 'I fear a nerf' camp. Love what the recent new tomes have offered armies and very excited about the prospect of a new one for us! Alarielle might even get a natural bonus to cast in it!!