I'm super mega 1337(read: somewhat good) at Ezreal, and abusing the easy kiting of JG creeps, you can stay full HP in JG, people try to invade you thinking they can fight you since you shouldn't have any HP since you have no sustain or tankiness, but come in with 3/4 HP or so and you're still full. Plus, I take ignite instead of flash, so I gank with red immediately, have E to deal extra dmg and keep slowing/dmging them, and ignite, it's actually pretty decent since you get a cheese kill and can snowball, and Ezreal with bloodrazor is pretty funny because of his insane Q poke.
I think the thing is they're a lot healthier than melee JGs because of the kiting, so there's less hesitation to gank, less chance of outplaying by killing them if they do gank, and, yeah, red from a distance and red smite from a distance and such can hurt. Ezreal JG isn't even good, it's just a funny cheese I do in normals sometimes, since I usually ADC(Ez Main) or JG(not sure if I play vi or wukong better there), and decided to combine them. I haven't lost yet since I abuse the mechs I learned from both, but, then again, I usually only play against high silver to mid Gold in norms, so, yeah. Take it with a grain of salt.
Also, on the same point of kiting making you a lot healthier, if you notice, good junglers will kite the camps even as melee, because they can dodge an auto from the camp a few times while clearing, which is practically essential now. Ranged champs can do this far more easily, especially with the mobility of Graves dash/Quinn vault/Kindred hops etc.
Nidalee's actually a little bit of an outlier, she can do the kiting well enough, but she has to go melee, too. The real thing about her is that she can place traps in advance to deal more initial damage in the course of time it takes her to kill her first 3 camps than her actual kit's power budget allows for the same amount of time against champs.
