Yes, I have noticed that they have gotten bigger and more extravagant. Is it a bad thing? Yes and no. Let me explain. Prepare for an argument that probably makes no sense, given that I'm writing at 2 AM.
It is bad, because it can get too... out there, you know? If it's too far out there, then it will look awkward. Let's look at Regigigas. It's an awesome pokemon, but it just looks like someone was high making it. I'm sorry if you like the design, and personally, I do too, but it just looks like someone was high making that thing, and that can turn a lot of people off, especially with the monsters becoming more out there, and even some become more complex, and it just doesn't look right.
But it is good, because they're allowing themselves branch out, rather then having animals with superpowers, or sentient sludge, or item spheres that came to life by being shocked. Variation is key, and if they continued to make pokemon designs like they did, then they'd start looking the same. There may be thousands of animals and legends, but they would eventually run together.
I'm not saying it doesn't happen, no it does. Regis and Sprites are two good examples. Is it bad? Not necessarily. It shows that these species are closely related. Mesprit, Azelf, and Uxie are closely related to each other, so they appear similar, same with Regice, Regirock, and Registeel. But that's the only case where it would be acceptable.
Personally, I like the new legends, sans Manaphy, and to an extent Phione, because they remind me of fetuses for some reason. Anyway, I believe that they did it so that people could see them as more... grande and amazing, larger then life, and more advanced, if you will, but a lot of people don't like them. Oh well, it's your decision, your own taste, you know?
I am sorry for putting you through that, but if it turns out to be good, then I retract my apology, I guess.