The first major update to Pokémon Go was met with pitchforks and torches. The app was an unprecedented international success, and, after the update, users had tanked its app store ratings. People were furious that third-party tracking apps were shut down and the update had made the game magnitudes more difficult.
On August 8, Niantic released another update aimed at a bit of course correction. The update, which was pushed out for both Android and iOS, hasn't been out very long, so the reviews on how the updates are functioning are scarce, but, so far, the changes in version 0.33.0 / 1.3.0 appear to be a step in the right direction.
The first major update says that Niantic has "made improvements to the accuracy of a curveball throw." Along with Pokémon being harder to catch, the curveball being more difficult to throw was a major complaint coming out of the last update.