Expansions have never been considered to be P2W in the gaming community unless said expansion brings with it MicroTransactions that are P2W, the idea of an expansion itself being p2w though, is a desperate cry.

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Class balance has always been a weak spot for GW2. While the new specializations for 95% of classes are superior to core builds, that isn't pay to win, that's just terrible balancing on Anets part, which they've had issues with since day one. They don't seem to understand that PvE, WvW, and sPvP all need their own balancing teams and shouldn't be balanced off one another. With that being said, GW2 is a pretty casual game, so I doubt we will ever get true balancing between the game modes and the power creep will continue with each expansion.