Junglers currently farm more than gank, but bot lane is now far easier to gank due to less warding going on there. Mid and top are harder to gank. Support are hardcore and can carry, with CC and burst damage being favored. Most supports start with one ward, a totem and a gold item, or a Doran's shield, a pot and and totem. Top laners currently are generally rescourceless and beefy as ****, or Nasus, who doesn't exactly have mana issues. Mids are currently valued by their map presence or map control. Ziggs for instance has come to power due to his excellent lane and objective control and less fear of Assassins. ADCs are typically mobile with high burst ( Lucian, Sivir) or have amazing tower pushing power (Cait/Jinx). Draven is currently also used simply because he dominates the other OP carries in lane.
Riven obviously falls of lategame. It's not as obvious as Lee Sin or Udyr, but dealing with her becomes less of a fuss because of everyone reaching same levels and allowing more organization in fights.
Jinx power is also related to how long games last, she really shines late game without necessarily having lane issues like hypercarries such as Vayne do. Definitely think Lulu is being underrated on your list, although I do believe she requires more thoughtfulness than she used to putting her at a "higher base skillrate requirement" (meaning learning her isn't as complex as, say, Thresh, but she's harder to get at first).
Hard to play but with some displacement in team really strong. You don´t really need oblivious Malphite. Good ult from Lulu, Vi, Shyvana can be enought.
Mid:
Top:
Jungle:
ADC:
Support:
Junglers currently farm more than gank, but bot lane is now far easier to gank due to less warding going on there. Mid and top are harder to gank. Support are hardcore and can carry, with CC and burst damage being favored. Most supports start with one ward, a totem and a gold item, or a Doran's shield, a pot and and totem. Top laners currently are generally rescourceless and beefy as ****, or
Also, mid lane became a lot safer, allowing a lot of unconventional picks to appear in competitive play.
The meta top laners have extremely strong teamfighting capabilities mnid game due to their inherent tankiness and damage.