I just found out about this game about a month ago. I've spent some time playing around, mostly with a mono darkness build. I started a second account to play around with some other elements. Once I hit the point of boredom (for me, grinding T3 for coins) I hopped on the forum. This opened me to farm builds (poison, phase shield), as well as SGs un-upgraded FG farmer. I sold off my upgrades to build that deck, and have been farming T5 and FGs both to learn the deck, and hopefully get enough coin to start doing what I want to do. That lasted a week, and now I'm back to being bored.
Currently I think the entry curve to the game is off kilter. Any CCG player can jump in and be farming T3 with no issue. However, aside from the intro quests, this doesn't gain them anything. Grinding T3 for upgrades is a LOOOONG process, even if you run something that specifically can win with full life each time. Past T3, you have T50, which is full of fully upgraded, fully tuned decks. You can get wins on the few that require strategy, but it's a losing proposition. T5 has hax, but you have a better shot due to the decks not being fully upgraded. You also have the added advantage of random cards maybe being rares or upgraded cards.
Moving into FGs, well, you have a series of finely tuned decks with double health, double the cards, and triple the quanta production, all with their own quirks and counters. Without knowing your upcoming opponent, and deck built for these guys has to be built for ALL of them. But this is all a gateway to the PvP scene, which requires all those pretty upgrades.
My issue is that no matter what you are doing, you can't get what you need. My deck needs a pair of Lobos. How do I get that card? I have to farm T50, T5, and FG, hoping to A) pull an opponent with the card, B) win the match and C) win the roll for the card I'm looking for. That's a lot of randomness to do something as simple as get a card you need for a build.
So far my complaint is that the entry requirements to having fun in this game is time. Not player skill or creativity in deckbuilding, just a ton of time to do the same thing over and over hoping you land what you need. It's an MMO, not a CCG. There isn't anything I can do to get 2 Lobos, or 2 Momentums, or another vamp dagger for the builds I'd like to play.
I love the CCG aspects of the game, but I can't stand the fact that it's going to take me a couple years of the same boring fights to be able to play the decks I want to play.