When it comes to mainline Touhou games there's not really many I dislike, but for some reason I really can't get myself to enjoy Ten Desires. It's not a bad Touhou game but something about it just makes it hard to enjoy for me.
ZUN threw all his ideas that could've been used for later games into the card system and didn't even bother to balance them. And it's pretty much a gacha, killing all interest in full runs due to RNG.
I feel like Touhou 18 was intended for more casual players with the card system, since it helps make trying again more appealing due to having access to new and potentially stronger cards. At the same time though I feel like Touhou 15 did that better as Point Device Mode lets new players practice as many times as needed while having a more interesting story and music.