IMHO, tabs can be best used in a few different ways. At first, they can be used as a general guideline of how to play a song, which will jump start the learning process, especially if you're pressed for time (preparing for a gig, rehearsal, etc.)
If you're more focused on ear training (which is an essential skill), tabs can be used to check yourself along the way as you're figuring something out by ear. Ideally, you'd want to figure out as much as you can on your own, and only use the tab for the parts that completely baffle you.
In the end, no tabs are 100% accurate, because it all depends on the interpretation of the transcriber. Besides, why waste time trying to track down tabs to your favorite songs, when you can spend that time (and save money) learning it yourself?