That's still like complaining about the visual similarities between African and European swallows. For a more relevant analogy, that's like saying that Yveltal is just a beefier version of Honchkrow. You're just being picky and objectifying Dedenne for being nothing particularly groundbreaking at first sight based solely on previous official designs.But they're too similar. Yellow? Check. Rodents? Check. Electric type? Check. Cutesy? Check. Cheek Circles? Check. Maybe I'll agree with your points in other things, but not the cheek circles. It's apparent that they wanted it to be copy of Pikachu.
This doesn't really phase me, because there's naturally going to be cream-of-the-crop character types in a game like this. Tiers are essentially the food chain, giving more viability to current predators/prey in between UU and NU would just whitewash everything that already happens to be threatening.That way, there would still be a gradient of pokemon strengths available for the single-player mode, but many more pokemon would be viable in the competitive scene, and Smogon wouldn't have to make up as many tiers to house them all, because battling would be mostly up to player skill instead of being mostly up to the base stats of the pokemon used (basically, imagine if there were only NFE, UU, OU and Uber - there would be far more pokemon in the middle two tiers, and pokemon in BL would ideally be brought into OU or UU).
Mega evolutions for pokemon that are already pretty strong don't make sense, and the pokemon that could use a mega evolution would be much better off with either a permanent linear evolution (such as Mawile evolving permanently into another pokemon) or a horizontal/split evolution (like Kirlia > Gardevoir/Gallade)
And as for their selections of MEvos, we'll just have to wait and see what else they chose before making any strong statements about how it effects the power creep.