Riven is kinda dumb in the fact that she can 1v1 or 1v2 almost any scenario and outdamages anyone at level 6. Not many people beat her in lane (most are useless later) and if you **** up one time and give her a kill (her 1398239810273 dashes, cc, and crazy damage make it easy) then you basically lost. Keep an eye on her if there is one on the enemy team because she roams extremely effectively as she is resourceless and has insane wave clear around level 9. If you can shut her down though she's useless. CC lock her late game for easymode ****.
Btw anyone wanna play when I get back to school and have reliable internet my IGN is Hibbity Hob