I like these changes. These new cards clearly show the PCL wants to go back to a slower, more set-up nature for the game. I wouldn't mind seeing the game heading in this direction.
The games might get a bit more expensive, but not ALL too expensive. I expect PUI to continue with great ultra-rare ratios, so perhaps we'll see 4 or even 5 Great cards per box, and maybe 2 Legends cards per box. Those sound pretty decent to me. Also, do remember there is an unknown drawback to the Great Cards. A good drawback, IMO, would be to only allow 2 Great Pokemon with the same name in them per deck. This way, the game wouldn't get too expensive by needing to hunt down 4 Great Pokemon, but only 2. This would be like a combination of the ex and Level X mechanics. (For instance, people only used up to 2 of a certain Level X (well, you could use more, but that would be a dumb idea) yet these cards would be like exs in what they evolve from.) And the LEGEND cards aren't super playable, and if they continue good ultra-rare ratios, they won't be REALLY hard to pull.
Btw, notice how Japan changed up their packs up a bit. This could mean that PUI could perform this as well, and they could finally bring the rares per pack ratio up to Japanese level. Or at least 2 rares per pack.
And anyone who says Feraligatr is broken, it won't be until an HGSS-on format. Speedrill mauls Feraligatr, and it won't like Legos much, either. It would fare nicely against Luxape, however.
These new cards DO suck...but only in the DPt era. Once we get a rotation to HGSS-on, a lot of these "terrible" cards could become a lot better. And besides, we have a grand total of 14 out of 130ish cards revealed. We can't really say anything about the set overall yet, and perhaps we'll see a counter rise to Feraligatr in the 115 or so cards remaining in the set.
I'm a bit unsure of how I feel of the x2 Weakness, but I do think this will help keep certain decks in check. Besides, we have already been moving to a x2 Weak metagame anyway, thanks to Pokemon-SP and Lucario GL.
My predicitions for the remaining 5 Great Pokemon are:
-Ho-oh Great
-Lugia Great
-Raikou Great
-Entei Great
-Suicune Great
I actually don't expect Celebi to be a Legend or Great Pokemon. Since it is more of an event Pokemon, I think it will be saved until Legends 2 or 3. However, when it does appear, I'd highly expect a Celebi LEGEND.
All in all, I like these changes, and these cards will radically change the way the game is played once we achieve an HGSS-on format. The game might become more expensive, but these can be fixed by good box ratios, putting them in tins, and putting certain drawbacks.
And there will ALWAYS be the cheap decks.