There's an article somewhere else about the phenomenon of power creep, how with each set [or at least each block] they have to make some cards a little more powerful to convince people to buy the cards. What it seems like has happened lately is that they're making Pokemon much more powerful and Trainer/Supporter/Stadium cards less powerful and/or influential. Certainly, there's less variety of TSS cards then there were at the beginning of the game. I wish they would bring back common Trainers that aren't just Switch/Potion/Energy Search.
Oddly, there have also been overpowered types of cards in each phase of the game. In the original sets, it was the Big Bad Basics (Hitmonchan, Scyther, etc.), in Neo it was the Stage 2 cards (somewhat), and in particular, they started making most Basics other than EX's (even non-evolving Basics) very weak during the EX sets, with horrendous attacks and 40 HP frequently.
Now, it seems they are emphasizing Stage 2 and Lv. X cards.
Oddly, there have also been overpowered types of cards in each phase of the game. In the original sets, it was the Big Bad Basics (Hitmonchan, Scyther, etc.), in Neo it was the Stage 2 cards (somewhat), and in particular, they started making most Basics other than EX's (even non-evolving Basics) very weak during the EX sets, with horrendous attacks and 40 HP frequently.
Now, it seems they are emphasizing Stage 2 and Lv. X cards.