Poison type is not actually that bad. Game Freak needs to give some poison types better move sets and stats to make them more useful. Toxic spikes is a the only status inducing entry hazard so unless your spinner is steel or poison they are getting poisoned. Nearly all of the poison type attacks have a chance at poisoning the foe. Drapion's dark/poison typing is great with only 2x ground weakness. Whirlwind/toxic spikes/cross poison/filler move lets you phase out pokemon and poison the enemy team. It's too bad Drapion doesn't have a better SpA stat because it would be nice to use Venoshock with that set. However sniper and cross poison make a good combo.
Poison type may need a boost but I think GF needs to make better poison type pokemon. Give them better stats and better move sets and I think we will see poison types get used more frequently.
Dark type friend safari with Pawniard, Crawdaunt, and Liepard
3x Shiny Halloween 2013 Pumpkaboo, Shuppet, and Drifblim