Currently I will have to say that Poison is probably the worst type in competitive play. With all of the Steel types out there immune to their attacks and just simply the lack of coverage proves this. Poison is only super effective against one type and that is Grass type which itself isn't used too often. This is a shame too because Poison is one of my favorite types but it simply can't cut it in competitive play. Now I will not say that all Poison moves are bad because Toxic is one of the most common and one of the best moves to use as well as Toxic Spikes, but running a Poison type Pokemon just isn't as viable. I have high hopes that the introduction of the Fairy type might make Poison types more common if Poison does actually turn out to be SE against it.
No. NO. NO. NO FREAKING WAY.
The Poison-type is actually one of the best types in the game. The reason for this is because while they are not good offensively, they are actually surprisingly good defensively, absorbing Toxic Spikes and having access to dangerous moves such as Toxic, as well as the mentioned Toxic Spikes. Poison-type moves aren't that bad - there are Sludge Wave, Gunk Shot, Sludge Bomb and Poison Jab. Four powerful moves that allow Poison-types to hit hard. And did I mention how annoying Tentacruel is?
Resisting Fighting and Grass is a great thing, as they are common types offensively.
The worst type in OU is in my opinion Fire. The reason for this is because Politoed and Tyranitar are everywhere in this tier and it'll limit the usefulness of the Fire-type. Pair that with a crippling Stealth Rock weakness and the fact that Dragon-types and Water-types are everywhere in OU, and Fire-types suddenly have a lot of trouble. They are super-effective against stuff like Scizor and Ferrothorn, yes, but they do next to nothing against Politoed and Tyranitar. Also, all Ninetales does is really to set up Drought, while Poli and T-tar can also do something else besides setting up rain or sand, respectively.
The Bug-type is in my opinion the worst out of all 17 types. They have the lowest average Base Stat total, no unique niches, no immunities and its STAB is resisted by six types (Including the common Ghost and Steel types). They are also weak to Stealth Rock as well as all forms of status. That's as bad as it gets.
I'd agree Bug type can be horrid without assistance from spinners because of SR. However, I still think that Scizor, Forretress, and Volcarona really do the Bug type well. Scizor is still one of the most common Pokemon used because of its sheer strength and ability to U-turn out of a situation,
Poison and bug are actually quite good. Both have numerous, useful resistances to support dual-types well. The ice-type is definitely the worst type to have- no useful resistances whatsoever and weaknesses to many common attacks. Since many things weak to Ice are doubly weak to it, Ice-STAB is rarely needed. Also, since it has nearly no representation in the metagame Gamefreak balances around, its safe to say that Ice is the worst type designed in regards to competitive play.
I also see your point about Poison types being able to absorb fighting attacks and T-Spikes, but in all honesty do that many people run Poison types for that? Some do, but I usually see a spinner more useful for clearing hazards because it can clear them all not just T-Spikes. Also there are other Pokemon that are great for switching into fighting attacks such as Jellicent.
Poison and bug are actually quite good. Both have numerous, useful resistances to support dual-types well. The ice-type is definitely the worst type to have- no useful resistances whatsoever and weaknesses to many common attacks. Since many things weak to Ice are doubly weak to it, Ice-STAB is rarely needed. Also, since it has nearly no representation in the metagame Gamefreak balances around, its safe to say that Ice is the worst type designed in regards to competitive play.
Actually, no. The Ice-type is a good type offensively. Kyurem(-B) and Weavile, for example, are very good Ice-type physical attackers, with the former also being able to go on a mixed or special route, while the latter has Pursuit, Ice Shard, Low Kick and a great base 125 Speed. However, you won't see Kyurem-C often in OU because it works best in hail, which is by far the worst weather (although it's also my 2nd favourite to use, after sand). Speaking of hail, Abomasnow is also a good attacker, with 172 SpA EVs being able to OHKO Scizor with HP Fire while 84 Spe EVs allow it to outpace it as well as Politoed and Tyranitar, and KOing them with Wood Hammer.
There's also Mamoswine, which like Weavile has Ice Shard, as well as powerful STABs in Icicle Crash and Earthquake. And let's not forget about Cloyster: its Shell Smash set can spell doom to many teams, but it has trouble setting up due to its downright horrible special bulk.
However, the Ice-type is indeed the worst type defensively, and I hope it will resist to Fairy-type attacks in gen VI.
its normal type without question; poison has good resistances and absorbs/sets Tspikes; normal has no resistances at all and hits nothing supereffectively, which matters a lot since the game is based around super-effective hits and resisting hits for the most part
I'll have to disagree with you on this one (and not only because grass is my favorite type). I'd have to go with ice because the only thing it resists is itself, while having extremely common weaknesses like fire, fighting, and rock. I'm only speaking in terms of defense here.Defensively speaking it should be none other than Grass-type, they have a lot of weaknesses like Bug-moves, Ice-moves, Fire-moves, Flying-moves, Poison-moves. Most have frail defensive stats, with Ferrothorn, Ludicolo being one of the few good defensive Grass Pokemon.