Onward to a new universe!
I'm going to say this first: I'm a HUGE fan of Team Galactic, so my review may be a bit on the...biased side. (Normally I use the Japanese names, but for these reviews I'll use the English ones just because of quotes, and to make it easier for people.)
This episode went above and beyond my expectations. After the first bit of setup, something happened that seems to be ignored by the other people in this thread: Ash showed us a little bit of maturity, something that he has been severely lacking in previously. When complimented on his badges, he replies:
"Thanks, Dawn, but I'm still gonna need five more to get into the Sinnoh League. This is no time to get too confident."
Now, if I remember correctly, getting too confident was what Ash was best at back in Kanto and Johto, and even to a certain extent in Hoenn. He seems to be changing a little from the energetic young boy he was in the beginning of the series, to a teenager who seems to know what he's doing. Maybe all those years of traveling actually made him smarter!
Next was something I (and many other fans) have been anxiously waiting for since Reggie was introduced: interaction between him and his younger brother. I was almost surprised at the way Paul was talking during his conversation with Reggie. His speech was much more casual, and he seemed more relaxed. Sure, Reggie is his brother, but it does show a little that he isn't incapable of warming up to people. There are siblings out there with worse relationships.
I was also very happy with the history of Veilstone City. It's good to see some background for the places around the Sinnoh region - it was sorely needed to supplement the rich mythology of the region. The whole "pilgrimage to see the meteorites" thing sounded realistic enough to me, which was a pleasant surprise.
And now to the main focus of this episode: Team Galactic. They made the episode for me, they really did. I breathed a sigh of relief when I heard Saturn's voice - for those of you who don't know, in the Japanese version, his voice actor was a woman. I was afraid that he would get a sex change in the dub too, but apparently not. This is the first time I've heard of the dub doing something better than the original.
Here's a little tidbit for you: the second scene with Saturn, when he was standing on the balcony above all the grunts, came straight out of Pokemon Special. In volume 12 of PokeSpecial, there is a scene in which Keane and the Mask of Ice of Neo Team Rocket are seen speaking to the grunts. This is the image. (I'm sorry, I don't have it in English.) This was actually a tipoff to me that they were going to do Team Galactic right - NTR is one of the most evil teams in Pokemon, or at least insane.
Also, Saturn's speech was quite a surprise. They really seemed to be serious about what they were doing:
"Then, after plan completion, we'll destroy this base and evacuate. It's vitally important we leave absolutely no sign of our presence here."
Moreover, the grunts did everything in unison throughout the episode (with the exception of Saturn's two lackeys). This gives them a sort of edge that we haven't seen from any of the other teams. Team Galactic is scarier, smarter, and eviler ("Destroy Croagunk!") than any of the other teams we've seen so far. They're on par with Hunter J. They were very thorough in their operations, jamming all the signals in the city to cover their operations (although it failed).
However, there are some key differences from the games here. For example, Saturn shows knowledge of the intentions of the team, unlike in the games. (For example, he knows that they're going to build the red chain, and if he doesn't know why, then he doesn't let it on.) However, his personality is pretty true to the games. I only hope that we get to see what he's like on the inside, the way we did in the games after the events at Spear Pillar.
Finally, the Secret Police! I was glad that the writers finally decided to involve the police. They were sort of necessary, because with a truly criminal Team comes someone who wants to arrest them. They might have been doing this so that they could involve Handsome, the Interpol officer from Platinum, later on.
My only few complaints:
1. "Check out those helicopters! They've been hovering above the park all day!" If Ash noticed this, I'm sure everyone else did. Why did no-one do anything about this, especially with the conspicuous yellow Gs on the sides of the 'copters?
2. Team Rocket stood out too much. They've had at least three hundred times their share of the limelight. They should have stepped aside at least a little, to let Team Galactic shine as much as they could have.
All in all, a great episode. This is why I watch the series.