A long long time ago, I used to contribute regularly to TripAdvisor but found that my reviews got drowned out by the sheer number of superficial or crusade reviews that I've mostly stopped bothering. I always stop by TripAdvisor when planning but either never linger long or have to really spend time to plough through a large number of reviews to really understand what a single property is like.

The conclusion? It just takes too much time to find really useful information.