Maybe Sand Force Landorus, but Sheer Force Landorus is ungodly powerful. He's my favorite Pokemon so I hope he doesn't get the Uber treatment again (lol) but SF Lando is definitely just as useful as Lando-T, if not more so.
A Lando-I Sheer Force, LO Earth Power may be the most powerful special attack (if it hits neutrally) without Status drops, turn of recharging, inaccuracy issues (but can be avoided with prediction), or Choice lock-in.
However, Earth Power and Psychic are not reliable or spammable coverage moves.
Perhaps if you want offensive prowess, try a Nasty Plot Thundurus-I/T, perhaps with LO.
I said this about Gengar and this also applies to Landorus.
One of the reason why I did not like Gengar in Gen 5 because it suffered from the indignity that a prominent physical wall checks it (Skarmory) since it could resist Ghost and its only recourse is to use Focus Miss to 2HKO it while Skarmory can Brave Bird, but with the Ghost buff/Steel nerf Gengar's presence can pressure Stall teams physical walls.
Earth Power does not affect Skarmory and Psychic is resisted. Lando-I has to use Focus Blast to hit it, although it may involve one try because a LO Sheer Force Focus Blast is more powerful than Gengar's LO Shadow Ball. One should avoid the temptation to run Sludge Wave to deal with Fairies since Sludge Wave practically gives Air Balloon steel types a free switch.
101 Speed is merely average for an offensive Pokemon and certain offensive Pokemon will remove its momentum and force it out. This is an issue for Lando-T to, but this is somewhat ameliorate with its U-Turn
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In contrast, Lando-T is useful in dealing with many physically offensive threats, particularly Excadrill and to a lesser extent, Talonflame (as Stone Edge misses). However, unlike Lando-I with Psychic, Lando-T does not have reliable means of dealing damage. Lando-T's offensive moves are there to deal with specific threats or to maintain momentum, not to threat entire teams with: Earthquake can be predictable; Stone Edge is inaccurate; and U-turn forces you to switch out while you may want to stay in.
Lando-T, while lacking offensive flexibility to due the nature of its moves, with its ability and some defensive investment (and perhaps Volt/Turn support) it is quite flexible defensively. Lando-T can switch in to more threats without prediction due to its ability and passive recovery, while Lando-I could only do so on a predicted Earthquake. Lando-I mainly comes in to revenge kill non-scarf threats, so there are fewer opportunities for it to wreak some havoc.
Also, Lando-T can defeat some offensive threats, provided they are not immune to Earthquake. It can beat Garchomp, who outspeeds Lando-I whether Garchomp has a Scarf or not, with the Intimidate drop. It can beat Dragonite with broken Multiscale with Stone Edge (as can Lando-I with HP Ice or Rock Slide)
Besides, Lando-I has to compete with Gengar as a special attacker, who now has access to a buffed Shadow Ball.
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Lando-T seems better equipped to deal with the meta.
