TripAdvisor - the go-to Travel portal
I rate TripAdvisor very high on two counts; one is the extent of its coverage- you can find a TripAdvisor review of most restaurants, attractions etc. Second, it provides insights a traveler is looking for to make his visit experience more memorable and possibly hassle free. It also comes with the understanding that not all reviews on TripAdvisor are free from bias- they cannot be.