Having participated in numerous Guild Wars with just the 6* Inhuman units, I can say that it's not so much P2W, as it is teamwork to win. Although, having specific units like Oda Nobunaga or Ieyasu Tokugawa in the guild is a nice boost.
Make no mistake though, this game/the team behind it is greedy as hell. Only deals like the New Year gacha are worth it and everything else is a ripoff. Now that I got Kenshin Uesugi, this game is never seeing a single cent from me again
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Except for Total War; I can't see that game mode as anything BUT a P2W function.