A lot of people look at vine briding as abusive, noobish, or altogether crap. But honestly, it's the only good spell in an otherwise lackluster book.
Sure, vine bridge is annoying and can change the tempo of the game. Sure it can. But so can shock bomb, or frost shards, or water trolls. It's just the way the game is played. Unlike a person using the Storm, Frost, or Ocean book, though, the nature-user has little in the way of other spells. The entire book is designed to trap you and hold you still, and that's all it really does well. The only winning tactic I've seen even remotely effective has been to entrap the victim in a Vine Bridge or to trap them in a Vine Bomb, and then use Thorn Bomb to detonate later. Certainly, it can be effective, but there are so many things that can go wrong with it.
Personally, I say that Vine Bridge is one of the few reasons to even consider the Nature book. It provides the individual with a first-turn generator of tempo, allows for traversing of difficult terrain, is quick and easy, and requires another, relatively useless spell in the form of Vine Whip.
The terrible truth about Vine Bridge? It's practically the only spell in the Nature book that is worth using.