Yes, I think engine power is fine. I'd love a few more ponies (who wouldn't?) but 208 hp has proven sufficient in the ~6k miles my wife and I have put on the vehicle. Eco mode does kill the enjoyment a bit, for spirited driving. Putting it into Sport makes the DCT come alive -- so it's an easy fix. Personally I do find the QX30 to drone a bit, at speed. The cabin is not as quiet as I'd like. My Acura MDX is much quieter, in that regard. Even my previous vehicle -- a 2015 GMC Sierra 1500 Denali -- had a quieter cabin.
That said, we really like our QX30.
2018 Infiniti QX30 Premium AWD - Majestic White
2019 Volvo XC60 T6 AWD Inscription - Onyx Black Metallic
2018 Honda Gold Wing Tour - Pearl White