Mega Altaria S -> A+
Disagree. MAlt still remains as not only a top-tier threat as a wallbreaker but also as a wall, capable of defeating the other mons in S rank except for Clef. While offensively it is outclassed by Zard X, defensively it is still better with its great Dragon/Fairy typing.
Mega Gyarados A+ -> A
Agree. Mega Gyarados falls as good DDancer. Sure, its good, but it is largely outclassed by superb DDancers by the name of Zard X and MAlt. Cant say much that hasnt been said already, really.
Heatran A+ -> A
Strongly Disagree. This mon is still awesome today. Don't prepare for Heatran and you can get terribly walled by the core of the Earth. The mere fact that everybody is prepared for Heatran means that it is that good. Don't think otherwise just because it has a x4 weakness to Ground.
Mega Alakazam A -> A+
Strongly Disagree. M-Zam is like an F1 car on a sports car race. Sure its speedy and so nice to seen on paper. But on practice, you'll soon regret that it cant turn properly. It is terribly frail and will fall to even strong neutral physical hits with a terrible typing defensively, leaving it vulnerable to bulkier mons including walls such as Ferrothorn (that has a chance to OHKO via Gyro Ball which even +252 SpA Modest M-Zam can't with Focus Blast).
Weavile A -> A+
Disagree. While the top 2 most popular mons are x4 weak to ice (Garchomp and Landorus), its frailty and x4 weakness to fighting, together with being weak to fire and steel (two really common types), makes it not that worthy to use.
Starmie A -> A-
Strongly, vehemently, definitely Agrees. While having base 115 speed in OU is above average, its frailty makes it very easy to KO. It also loses to alot of hazard setters such as Ferrothorn, Clefable and Chansey. IMO, the only thing thats keeping it in A is the popularity of Garchomp and Landorus-T with its LO boosted Ice Beams (which is not STAB, btw); though be warned, a scarfed Landorus-T will do 70-85% damage with a U-Turn, which leaves it highly susceptible to be revenge killed afterwards.
Also, it is largely outclassed by the bulky Excadrill, which has a great defensive typing with steel. It'll even live most non-STAB SE special attacks (such as Physical M-Altaria's Fire Blast), among others. I like to pair it with an Air Balloon to maim or OHKO opposing mons.
Smeargle D -> Unranked
Agree. Don't really care that much about this Van Gogh. Its SW+SR set is largely outclassed by Shuckle, and when you are outclassed by a rock with tentacles, you've got some badly needed rethinking needed. THOUGH there might be another viable set for smeargle out there hiding in the deep dark shadows of the future, but keep it off OU for now.