I know you guys would hate me if I say these things, but I simply had to voice out my opinion.
Lati@s does not make Mence look completely retarded. Well, at least on the defensive side, because their ability to switch into things are different. By no means it is standard though, but this thing deserves at test. You can't theorize everything in pokemon.
Manaphy should not be uber.
Sure it is scary, lols at HP Grass, Raikou/CMBliss as its only counters, but I believe that the only reason that people think its uber is because people doesn't want to use CMBliss and want to stick to the standard sets. Sure, Sing and Seismic Toss is nice, but CMBliss does more than just counter Manaphy. It is no longer Pressured by Zapdos. It is no longer a Skarmory set up bait. It does not fear Rhyperior switch ins unless there's a sandstorm. It beats down Nasty Plot Togekiss (Togekiss can BP away though), Nasty Plot Azelf (unless it has Taunt), and possibly PorygonZ if you have enough luck of it not rolling at max damage twice (unless it has Hyper Beam to clear you out). Now if you can fit that in your team, Manaphy doesn't look scary anymore (well, ok it will have a hige Stallwar with CM/Rest/Rain Dance/Surf Manaphy but Bliss should eventually win because it has more PPs). It overspecializes you to one set, yes, but isn't every team supposed to have some way of defending themselves to special attackers anyway? (Light Screen + Cresselia, etc). How could you possibly be calling CMBliss overspecialized where everyone uses the standard set because it seems so practical.
Manaphy is the best bulky water in the game
Yes, we all know Hydration + Rain Dance is scary, but that takes up 2 moveslots leaving with Surf and either Ice Beam, Calm Mind or Tail Glow. This makes it easier to counter, and its still destroyed by CMBliss
It lols at Grass Knot. So?
There's Energy Ball and Thunderbolt. You might argue that Infernape doesn't get either of those two moves, but it still does get Close Combat. This is also another thing that makes Manaphy unique. Cresselia is the only pokemon that safely walls Mixmence, and Cressy isn't uber. THis part is very hard for me to describe, but loling at a commonly used move that has it's weakness written all over it does not mean its uber.
I used to think its uber, but after seeing how CMBliss easily fits into my team I decided to change my mind.