Casual was fine. Did I have a blast? Was I obsessed and couldn't stop playing? No, it wasn't that fun, but it was a nice lil' quick distraction to play when you want to play something but don't have a lot of time.
The second I started playing ranked all the fun was vacuumed and sucked out of the mode. The competitive aspect and Rank climbing with the numerous problems the game has (the overabundance of cc without any diminishing returns, the downright broken LBs (looking at you WHM), the scuffed randomized matchmaking, the frustrating map design of certain maps (Volcanic Heart is literally just toxic for casters), the limited communication AND the inability to play with friends, to name a few) it just makes the entire mode way too frustrating to bother with.
Being hardstuck on Gold (or any Tier for that matter) because of a constant seesaw of 1 win, 1 loss, 1 win, 1 loss, 2 wins, 3 losses, 1 win, 1 loss over and over and over is not fun whatsoever and has pretty much completely drained all my energy and desire to keep trying. No play you do can change the game around (save for two classes that have the ability to do that), you can't individually win a game and half the time your teammates are orangutans jumping around and forgetting that it's an objective-based mode. It has gotten tiring, boring, frustrating and just downright not fun anymore.