I was a religious player of pokemon during the energize your game era.
Later I played magic up until they ruined the game with the release of mirrodin, and made my entire card collection obsolete overnight. I was a poor kid, so I quit not long after, but mooched friends’ decks to play for years after and did take part in a few FNMs though its more fun and chill to play magic with friends. I enjoyed the golden era of EDH before wizards ruined that too by trying to capitalize on it.
For a short few years I played yugioh in its initial popular times in america. Played it at my school club for it primarily and with a few friends. I quit after leaving that school.
Magic was the most fun. The current iteration is a powercrept cringefest with way too many keywords. Yu gi oh was fun enough. I remember enjoying the strong themes you could build decks around. I remember building an “umi” deck, around water themed cards and how they synergized together with the card umi which also boosted them. I’ve talked with current yugioh players and it sounds like the game turned into an unbalanced mess. It was told to me that games can last 0 to 2 turns on average, but its mostly a long slog of combos in one turn. That if you don’t get your ideal opening hand, you just end the game before the game starts.
I looked into flesh and blood for a bit. But I was told not to bother, its like paying the prices for top tier magic decks, worse actually, for a new unproven game where you will struggle to find a playerbase. Though funny enough I have a place near me that has players. But I find its play interesting in concept, can’t say for sure if it actually is fun to me. I had a similar idea for a cardgame style to what they created. It seems they scuffed their rarity system making playable cards too hard to get from packs.
Pokemon has the weakest playerbase near me. So I can only surmise that pokemon is actually very unpopular. However I’ve always liked how it played. I played at home with a friend and I built us two decks when they put out the urshifu rapid strike and single strike deck products. And it played pretty balanced against each other, which is why I chose to buy them. But the vmax thing was way overtuned. So since then they have I think, successfully toned down the power and the boom or bust feel. The original card game core is still there as I recall from 1999. I just wish I could play somewhere I didn’t have to drive 30+ minutes to get to on a day I can attend. Its a shame, as a competitive deck is very easy to build affordably, and they print and reprint playable cards, even putting out deck products around popular decks in rotation.
Lots of little games come and go but I usually don’t try them. These days anything new seems to get targeted by speculators and scalpers, making it impossible for me to try them. Latest example is the gundam game. i was super excited to try it, but it was scalped super hard at release.
They are all very different games, which is why they can coexist I think for the big 3. Even though I think they have their respective issues, they have too many long term players sunk into them to be easily killed off.
But to give you an idea of the amount of rules in Yu-Gi-Oh, 
); deck-building tips and an explanation on card advantage in Yu-Gi-Oh and the mathematics behind a 40-card deck; etc. Excluding the links and glossary to the used card effects for the explanations, it’s a 69-pages long A4 book. 