Never used Lando-T, so not going to comment on it. 
I know I'm not the first to mention it, but Mienshao needs a ranking. While it does face competition from similar Fighting types (Infernape, Mega Lopunny, and especially Terrakion), it does hold its own niche above them with its High Jump Kick - its very literally the strongest Fighting STAB you're going to pull off in VGC (Iron Fist Conk's Focus Punch hits harder but let's be real here), a staggering 54 base power above Terrakion's Close Combat. LO sets offer insane power, OHKOing 4/0 Garchomp and 252/44 Rotom-W with HJK, thanks to even higher damage output than 252+ Mega Mawile's Play Rough. It also has an array of support options very similar to Hitmontop: Wide Guard, Quick Guard, and Feint give it a fast, powerful, and supportive presence similar to Talonflame. Its also hands down one of the best MegaKhan checks: even with Intimidate, LO versions OHKO bulky Adamant Khan, and even with a Sash and Intimidate offensive versions are demolished. Something Infernape just doesn't offer with 21 points lower base Atk and 54 less BP. Even Terrakion struggles to OHKO in Intimidate:
-1 252 Atk Life Orb Infernape Close Combat vs. 252 HP / 0 Def Mega Kangaskhan: 151-182 (71.2 - 85.8%) -- guaranteed 2HKO
-1 252 Atk Life Orb Terrakion Close Combat vs. 252 HP / 0 Def Mega Kangaskhan: 174-211 (82 - 99.5%) -- guaranteed 2HKO
-1 252 Atk Life Orb Reckless Mienshao High Jump Kick vs. 252 HP / 0 Def Mega Kangaskhan: 226-268 (106.6 - 126.4%) -- guaranteed OHKO 
-1 252 Atk Reckless Mienshao High Jump Kick vs. 4 HP / 0 Def Mega Kangaskhan: 174-206 (96.1 - 113.8%) -- 75% chance to OHKO
Don't take it as arrogance though: Mienshao very much struggles against faster opponents, and although 105 Speed is very good, things like Terrakion and MegaGross just plain stomp it. 65/60/60 bulk is horrible, and pretty much any attack is a 2HKO at absolute worst (though it 
barely dodges a 2HKO from MegaKhan Sucker Punch). No secondary typing means that anything resisting Fighting is a problem. Bulky Pokémon like Zapdos and Cresselia simply destroy it, though they do have to watch for coverage moves (Stone Edge, Rock Slide, Knock Off) and Mienshao does have U-Turn as an option. Its completely destroyed by all forms of Speed control, Intimidate, and WoW. But imo, its fast Fake Out, Quick Guard, stupidly powerful HJK, and handful of other options make it about a C rank threat. It takes a fair amount of support, loses a lot of momentum against faster threats and Cresselia, but can absolutely devestate an opponent who is underprepared, unsuspecting, or simply lacking a Fighting resist while limiting the foe's options with the Guard moves and Fake Out, or simply hit and run with Fake Out + U-Turn and clean up later when its threats have been weakened. I've used it for months and on the whole, its kicked a lot of ass.
tl;dr 
Mienshao for C rank, it fits the definition very well: 
	
	
		
		
			Reserved for Pokemon that can work okay within the VGC15 metagame. However, they either have crippling flaws that prevent consistent performance or require much team support to work on most teams. Pokemon that have a few niches in the metagame but are mainly outclassed by higher-ranked Pokemon also belong here.