Funny, I just had this same feeling on Sunday. Yes I suck, but remember when you sucked you loved snowboarding, that's why you became better. The reason I wasn't feeling it was because we just had a great powder day the last time. This time, it was only one day after a decent snow, and it was super hard pack. And it sucked. After the first run, I felt like sitting it out until the snow softened up a bit. I was also thinking maybe my season was over (even though there is a lot of spring riding around here).
But I kept at it, and then the snow softened, and then we started to mess around more on the terrain features (again we suck, but that's when its the most fun isn't it, learning?).
That is on my local not so great mountain (bear mountain). But I'm going to Norcal so I may hit Tahoe, and may hit Mammoth, so I can get excited for those. Just not my local mountains, I might be done with them for the season.