I think I saw that someone answered this. Feldberg talks about it in one of the youtube clinic vids, I think the one where he gets all geometric on height/fade? A more angled runup helps, angled R to L for a RHBH. But, I've found I have to work on it to get all the timing right to hit the line I want. Or standstill/OH/FH if possible on the shot? FH is much easier for me with an uphill lie. There's a DG Monthy vid from one of the last couple of Seneca Soirees. They've got some interesting pads there. You see Brinster a few times doing some gymnastic runups from off the side.
I can give uneven pads a pass to some extent, say on older courses. The pad could've been level when installed, and erotion etc over time can cause the slant. Never done it, but I'd imagine trying to relevel one when this happens is much worse than the original pour. But I agree I don't like teeing on an uphill teepad.
But, being over 6 ft and long legged, I can't stand REALLY short tees that aren't reasonably flush to ground level. I don't need them to be huge, though those are great, but there are a few around town here that are, like, novelty tee pads, like tee pads you'd have on your desk as a decorative example of an acutal tee pad. When like 4-5+ inches above ground level, this totally sucks and upsets me beyond reason.
Oh, and while I'm crying about it, the pads they have @ the Mounds in Oakridge, TN, are the worst. Natural pads framed by raised, like, 6x6's or RR X ties. makes me nuts.