I don't think "Inconsistent" is the word I'd choose to describe the tournament greens.
But ****** is a term that will surely get censored, so I'll just say this instead...
... "Amplified".
The downhill putts roll faster, and the uphill putts seem to "die" quicker. I find that if I look at my putts with this in mind (while taking everything else into consideration), the putts I take work out to be pretty consistent from hole to hole.
Also, I take into consideration (on the longer putts) that the initial velocity off the clubhead "negates" alot of the "ball-slowing effects" of an uphill slope until the ball actually begins to "roll" on the green. For example, on a 30ft putt, I'll usually "discount" the first 4-5ft, but on a much longer putt like a 60footer, I'll discount the first 8-10ft as "flight" rather than roll. This, of course, is if that initial "flight" is over an uphill slope that doesn't interfere too greatly with it.
On the longer putts, the ultimate "death" of the roll is really tough to judge, especially when there's a late break in its path, hence I tend to try to "putt through the hole" if there's substantial rise at and after the cup.
I've done this on the very fast greens, and have semi-successfully managed to apply it to the tourney greens. Hope I've explained it well enough.