Mega Venusaur is the only one I think is an improvement over the original. I've come around to liking Mega Blastoise, too, but it still hasn't surpassed the original. I wouldn't call it a downgrade, it's just different.
Mega Charizard is a downgrade, though. Arm wings are dumb and the head spike is too long.
http://i.imgur.com/z7h3ZVX.jpg "First time I got punched in the face, I was like "oh no", then I was like "this is a story"."
I think MegaVenusaur was the only one that improved, design wise. Maybe Mega Blastoise if the cannon over his head wasn't so large. A little smaller, and I think it would have been perfect. I like the wrist cannons a lot.
That said, I can't decide who is going to be along side Froakie, if we have a choice: Bulbasaur or Squirtle.
"Gary was here. Ash is a loser!" = Greatest Tramp Stamp Ever Green & Blue Bird, this is Mr. Fabulous, we are a go for cheesin' it. - Bender
How do people think any of the designs are better? All Venasaur has is a flower on his head and a few vines thrown about. Charizard has a few bigger wings and spikes on his head. Blastoise has two odd-looking cannons on his arm and his head looks freakin' ridiculous, especially that chin.