Betrayed? No.
Disappointed? Eh, a little. The Wii U has had some absolutely fantastic games and given us more new IP that I think will last (Splatoon, Captain Toad, etc.) than the Wii did; but overall, there was a lot of missed opportunities and the game library is a definite downgrade from the Wii and even the GC. Personally, there are no games that I've played on Wii U which have really hooked me in and made me feel like I really want to play them again, which is a first for me. It's clear that the Wii U is finished though, so I'm happy to move past this once-off disappointment and look forward to whatever the NX offers.