First of all, I don't build WW in the typical/recommended way. I get artic burn first but max it as late as possible due to its poor scaling. If anything I would attribute to my success to the artic burn + splinter blast combo, which is almost literally guaranteed to deal at least half of your lane rival's current health at any point in the laning phase. That alone makes WW a ludicrous zoner. But add it to the fact that most low level pub teams run duo offlanes and that combo can be applied to two people at once at no additional mana cost and... yeah. Its kind of ridiculous. If my laning partner is a potato we'll "merely" stay in lane, otherwise we'll crush them and they'll get no last hits. I also don't nearly buy the recommended items:
Starting: Courier + tangos + ring of protection + 2 clarities + 2 branches
Early/Core: flying courier > boots > wand > ring of basilious > buy ring of health, disassemble ring of basilious to make tranquil boots > soul ring > force staff. Intersperse with support consumables as required.
From there: Glimmer cape, medallion, BoT, in whatever order
I do think I might be getting matched with people bellow my skill level or something. I also got very lucky with my win streak that no one disconnected 10 minutes in or whatever. That being said supporting really does make a notable difference, probably the best way to carry pubs solo (or maybe second best, after mid). WW is fun too because 3/4 of her spells don't give a shit how late the game has gone. If I have any complaint about her it would be that her ult is a bit weak at the moment but with force staff + ult + medallion + splinter blast you can be reasonably sure of a kill if your enemies are dumb enough to bunch up. If nothing else it has exploitable quirks; you can use it to force invs heroes to break invisibility or to stun someone through BKB. Also great for disengaging, like a baby version of Naga Siren's ult.
I dunno, fun hero, underrated at the moment. Best as a counter pick to physical lineups and certain heroes (Legion Commander, Pudge, Huskar).