A few thoughts:*As you can see on Serebii, not all of the base stats have been released for each Pokémon: However, those that have been are reasonably balanced compared to what we’ve seen in past games. Blissey had 255 base HP, and Shuckle had 230 base defense; there’s nothing even comparable here, though there are a few 130s, 135s, and 140s. The highest here is adorable sunfish Mamanbou’s 165 base HP.
*There are some novel type combinations that we haven’t seen before, but not very many look all that good. James: “It seems they’re mixing the ‘scary’ types with regular types to make new combos. Dark/steel, ground/ghost, don’t remember those.” Something like Dark/Steel sounds cool, except it’s 4x weak against fighting and only neutralizes Dark’s ghost weakness; no defense against Steel’s ground or fire weaknesses. There’s a lot of stuff like that, and it gets worse when you throw elemental types in, like the hilariously weakness-riddled Dragon/Ice Kyuremu.
*Remember: We are stuck with these. The creators of Black and White have stated that none of the old Pokémon will be in the game as a means of starting the series afresh for new players; we assume that there will be some means of porting the old Pokémon over from other games, but even that isn’t officially the case.