As of pay to win it depends. You can win without paying (and there is players who are very good and doesn't pay) and you can't win just by paying.
If you boost your economics by paying, than build units faster (there is still hard caps, which is the same for everybody, paying or not) and than meet player with much better tactical skills, you will still loose. With good tactics, you can easily outperform larger armies than yours.
So you can't win by paying and you can win without paying a penny. And if you don't pay, the times (construction, production etc.) are still very reasonable, unlike other similar games, where you either pay, or wait days and weeks.
pigster6
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