The one and only TGC I play is yugioh, not because I'm a total fanboy but because that's what all my friends play. I play it a lot with them and I go to tourneys every once in a while, and I'll tell you that the game these days boils down to two things- you take control of the board and make it hard for your opponent to do anything, or you put enough high ATK monsters on board to OTK. However, there are honestly a lot of ways you can do either, and there is one factor that has recently diversified it quite a bit- a new card, called Cards of Demise, has recently been released. It's a generic draw card for decks that don't special summon a lot, and lets you draw enough traps to control the game. That alone has drawn a lot of players back to competitive play.
Besides that, yugioh is still a lot of fun, and very diverse (and yes, it does take skill if the two decks involved are on par). Most of the time, the game is like solving a puzzle. You have to figure out how to set up a good board turn one and control the game, or how to break up an opponent's board and maintain control yourself or kill them off. Deckbuilding is very much an extension of this, where you have to figure out how to consistently deal with the wide variety of decks you'll find. Pendulums, while very good at this, do not control the game, they have advantages and disadvantages like every other deck. The prominent decks you have to account for now include Kozmos, Monarchs, Demise decks, Dracopal Pendulums, Blue-eyes, Magician Pendulums, and the decks that come out in the next booster set- Subterrors, Metalfoes, and possibly Dark Magicians.
The only downside I will say is that it's expensive. A meta deck will cost you upwards of $100 dollars. However, the new Metalfoes have been announced to be a cheap rarity, so they might be affordable. There is also a very competitive variant of Monarchs, which won Nationals, that costs $30-$50. Another detrimental factor is the end of Dueling Network, the most popular simulator, after a cease and desist order
If you wanna get back in, now's a good time. The game is getting cheaper, and a new competitive season will start in August-September after Worlds.