AD Ez can be very strong if you can aim a skillshot. Double just played it today in the LCS and had great damage numbers. Granted he's Doublelift, but if it's good enough to play in the LCS it's good enough for solo queue.
The first blood thing is a bad mentality to get into. Because the reason they're now tilted is likely because you're now in chat going "GG TOP IS A FEEDER. AFK NERD"
And you aren't taking that into account once again. Lets say that it's the split push comp team vs...
Mundo/Sejuani/Lulu/Kog'Maw/Nautilus
That's actually a really nice protect the Kog'Maw composition, if I do say so myself. The issue with this matchup, however, is that the Kog team wants to teamfight nonstop. If the enemy team is split pushing all game, they have to deal with it. Otherwise they engaged on the Trist and Ziggs bot lane and okay cool, they killed both of them.
The issue now is that Jax is solo pushing top and Bard and Trynd are mid lane, and once that tower is gone Bard uses his Magical journey to go top and meet up with Jax. They just got your mid tier 2, your top tier 2, and likely a huge chunk of your top inhib turret assuming you noticed them in time.
And what are you going to do? Split up to fight them? Sejuani and Lulu aren't exactly going to outdamage Tryndamere and Ziggs, not even on a good day. They aren't going to outduel with Trynd's ult running, and they CERTAINLY can't hold off Ziggs' waveclear. Comps are made to beat comps, and your attitude certainly is not helping your winrate.