But, for the sake of it, let's have a serious conversation about the draw, and the field's chances in general:
Some of the names who aren't in Nadal's half are irrelevant. Obviously, the bottom half is stronger, no doubt about it, but are we seriously lamenting Nishikori being in the bottom half? What chance would you have given him against Nadal at RG...10%? I legitimately think that's way too generous... so, 5%? Is that what we're fretting over then, a 5%-10% chance? Alright, so what about Wawrinka? Even if we ignore last year's final (and Nadal's ridiculously lopsided h2h record against him...It's 16-3 by the way), Stan is returning from injury and hasn't done anything relevant this year yet...but he's a threat to Nadal at RG? So what about Goffin? Well, he's Goffin... So, that pretty much settles that.
Keep in mind, seeding matters. So we can't lament Nadal not being able to play Zverev before the final... They're the top 2 seeds. They can't play before the finals. However, it's important to note that Zverev, to my knowledge, has never even made it to the second week of a major. If I'm an "anyone but Rafa" fan, Zverev not being able to play Rafa until the final can be a good thing as it means Zverev would have to play the tennis of his life to get to the final, where things, theoretically, can be interesting (of course you can counter-argue by talking about pressure, the moment being too big, and you'd have a point, but it's Nadal in the final of RG...you're an underdog no matter who you are).
Thiem being in the other half is definitely good for Rafa. No debates there.
Djokovic to me, is the most interesting case. Yes, in theory, if Nadal were to play say: Djokovic in the QF, Thiem in the semis, and Zverev in the final, his draw would be "tough." Except, out of those 3, only one guy has a realistic chance, and that's Djokovic (if you want to believe Thiem or Zverev have a good chance that's on you). In his current form, you would much rather for Djokovic not to play Nadal until the final, because by then, this would mean Novak has A) played well B) beaten some good players and C) gained confidence...none of these things he's managed to do all year. Yes it also means he's playing Nadal at his peak, but given the current situation, I'd say Novak would prefer to play him in the final, which wouldn't have been true in previous years.
Now to look at the guys who could actually play Nadal... To me Cilic/DP, should one of them make the semis, are actually interesting opponents. By now we all recognize a number of factors have to come into play to beat Nadal at RG, but 2 that always come up are: Opponent catching fire, and Nadal having an off day. They definitely have the type of game that A) is very dangerous if they catch fire and B) are perfect to punish Nadal if he is having an off day. Despite his dominance last year, Nadal actually had slow starts in both the semis and the final. He was nervous (acknowledged as much), was dropping the ball short, and playing tentatively. Problem is, so where Thiem and Stan, and they failed to capitalize. What ended up happening was Nadal broke first, gained confidence, won the first set, and pretty much crushed them from there. If he actually loses the first set, you take away that insurance policy and all of a sudden he may not be as confident in stepping up his game and cruise...
I'm not trying to say this is a tough draw or anything... but I've always maintained that a DP/Cilic type player, on a good day, is more dangerous than the usual suspects... and Novak is always the guy with the best chance to beat him, and the possibility of him making it to the final makes things slightly more interesting.