I definitely think so. From looking at screenshots, the battle backgrounds are completely unchanged from Diamond and Pearl's (and Platinum's) gradient backgrounds. This is inexcusable for two reasons. One, battles are a key component of Pokémon, and looking at uninspiring backgrounds can really make battles look boring fast. It would give the game a lot more life if the battle backgrounds reflect the location you are in (like the GameCube games, or even other RPGs). And two, they're completely unchanged from D/P/Pt's backgrounds, which, in turn, are just Generation III backgrounds with slightly more flair (I stress the word "slightly"). And the GBA backgrounds, in turn, were bland even for their time (I've seen some obscure GBA RPG released a year before Ruby/Sapphire, yet has much more aesthetically pleasing backgrounds). They have no style whatsoever, except that the color changes depending on where you are. I remember the day I got Ruby, and was unimpressed with the backgrounds.
We live in the year 2009, and the designers can't come up with more interesting backgrounds than gradients?