They've really screwed things up with the way they presented the Observers. The Observers have the ability to manipulate time, and to "Teleport", etc. Yet, they're all keystone cops when trying to track down Peter, Walter, Olivia, etc. in the city? Really? They show them teleporting themselves like 50 feet behind the group who's running away, and it's such a sad failure of logic that it completely turns me off to the show. If the Observers truly had the powers that they've show so far in the series, then there would be no way they could be stopped by those without such abilities.
This show had so much potential, but it's just spinning out of control now with the dumb future timeline BS.