Landorus isn't anything like any other 'Mon that got banned, it's insanely strong and can run almost anything as its coverage move. Earth Power is literally the only "staple" the rest depends upon what kind of team you're running and what kind of set you feel like running. It's retardedly strong and just runs whatever it wants as coverage. It has so many coverage moves that make it impossible to have a perfect counter to that isn't named Mega Latias or Cresselia. Sure, it can get picked off by priority from 'Mons like Talonflame, Weavile, etc, but they have no way of getting in safely and will require a Pokemon to be sacked. It also can run different sets to run over different playstyles, Rock Polish to clean up vs offense, CM / Knock Off to wallbreak, and 4 Atks to destroy balance teams.
Here are three SPL replays that display this:
1,
2, &
3). In the first replay, Ether is running SR / Earth Power / Focus Blast / Sludge Wave, which has an amazing matchup vs lady bug, whose only ground resists were Skarmory and Celebi, both getting 2HKO'd by Landorus' coverage moves. In the second replay, Adam runs Sub / EP / Sludge Wave / HP Ice vs Reymedy, whose only answer to Landorus is Gliscor, and gets up a free Sub vs Clefable using Knock Off, forcing Reymedy to sac a Pokemon, Adam later gets another Sub up and sweeps the last four Pokemon. In the third replay, IAmGingy is running EP / Rock Slide / Knock Off / HP Ice, grabbing 3 kills and weakening last 'Mon Tangrowth to the point it's easily revenged by Alakazam. This isn't an argument of "he counterteammed" and had the right set for the game, it's moreso predictability, knowing what trends these players like to make and what Landorus set punishes their common choices the most and knowing what your team needs the most.
The argument of "Balance and Stall will be too hard to break and too risk free" isn't true, nor is it a good point to not ban Landorus. Landorus
is a broken Pokemon, which is reason for it to be banned. Right now, Landorus is a no risk balance/stall breaker. It fits on a lot of different teams and is easily the best at breaking these playstyles. There are plenty of other Pokemon that can break stall or balanced builds, but non are near as risk free and none of them are broken. Something like Manaphy requires you to be running the right moveset and you need to get it in for free, while being easily revenge killed and forced to have to TG again later in the game. Kyurem-Black is, first of all, weak to Stealth Rocks, but also is either easily countered or can get worn down extremely fast. It's forced to run Iron Head or HP Fire over Roost, forcing a timely switchin in and good hazard control. Life Orb Tornadus-T also has flaws, due to its Stealth Rock weakness, Hurricane inaccuracy, and its inability to provide much defensive synergy, and even less in a metagame without Landorus. And then there are all the balance breaking Megas, such as both Charizard forms, Gardevoir, Metagross, Alakazam, and Scizor to a lesser extent. All of these 'Mons are really good, even if they require your mega slot.
Landorus is insanely strong Pokemon, I have seen very few, if any, good arguments saying Landorus isn't broken, merely it makes the metagame better. I disagree, a metagame with a 'Mon that forces you to run things like Mega Latias and AV Torn-T on any team that isn't offense, isn't a good one.
Ban.