I'm not really sure how to explain my issues with the left pad... I think the best comparison I can make is, you know how you don't really know how far you have to press an analog trigger until it takes input? For me, the left pad feels like that. I know there's a general area I have to move my finger into, and the haptics help to know the action is inputted, but activation isn't immediate. What I mean is that I have to slide in that direction until it activates, whereas with a regular d-pad, you just pivot in the general direction you want to move in, which is immediate. So there's a tiny delay to my actions, if that makes any sense. Same with deactivating; I have to think about it and slide out of there. The size of the left pad doesn't help at all, in this case. Since games that rely on digital movement tend to be a lot more about precision, it really hurts during gameplay. And then sometimes I misstep in the middle of frantic scenes by overshooting the deadzone, which messes me up. Less of a problem in click-to-activate, but I find my thumb getting exhausted very easily as it grinds across the left pad.
It was fine for games with two primary directions, such as Super Meat Boy and Downwell, but when I used it for games like Touhou 6 and Dustforce, the "delay" I described, coupled with the increased amount of directions just knocked me off. Even in a top down RPG like Earthbound, where immediate movement isn't important, moving around still felt a bit clunky due to this. Ness would have a very small delay turning to the right direction as I swiped across the left pad. I'm sure with practice, I could get better at it, but the left pad doesn't really bring anything above what the analog stick provides in digital mode + haptics on, so I don't really find it worth investing time into. Yes, the analog stick technically isn't immediate like a real d-pad, but it's area is much smaller, so it feels a lot more snappy than the left pad does. I've yet to have any issues with it; heck, I'd say it's a perfectly fine d-pad substitute that doesn't take too much effort to learn.
There's tons of love for the left pad being used for movement within the community, and I wish I could understand it. I will probably give it another shot down the road, and stick with it with a more extended period of time, regardless of my gripes, but I haven't really been in the mood to experiment too much with the device lately. Right now college has shoved itself into my already crammed schedule, and by the time I reach the weekend, I just kind of want to sit down and play some games on my TV without too much hassle, haha.