The initial experience was fun. The PvE is great compared to others of the genre. However, for joining the genre 5+ years late, it doesn’t even have basic functionality such as a match summary or replays, friendly battles, etc.
Although technically free, PvP may as well be gated behind a paywall. Your unit levels have throttled/capped levels as you progress in rank, similar to other games, in order to even the playing field at low ranks while the $$ players can rise up. However, you can pay $ for extra abilities for units, and those extra abilities are not gated by rank. The point formula for win/loss keeps most people, even cash players, at a low rank. So after you win ~5 games, you will be placed against people with full rosters of added abilities, against which there is simply no winning if you don’t also have the extra abilities. For f2p it will probably take 6+ months to get a single deck to this point.
If you are a cash player and are still interested, the PvP balance is horrendous. There are a handful of highly OP units, so every match is monotonous with highly similar decks, and deviating from the short list of OP units is a massive power loss.