Well, one of the things that the earlier floors do too is cater to the unlockable item. There was one set of floors where the first two, the cpu didn't block crap. Then, the last one blocked just about everything. Coincidentally, in order to get the item for that last floor, you had to CF all 3 of the cpu's charas. :/ In that regard tower is very meh. Weapon Master in SC2 was awesome for me learning the game for the first time, in terms of basic stuff.
Also, I really don't like how Arcade's opponent order is almost always the same. In this entire time the opponent variation has been, in order of frequency:
1 - X, Talim, Yun
2 - Voldo, Mina, Asta
3 - I don't remember
4 - Ivy
5 - Lizardman, Zas
6 - Sieg/Nightmare
7 - Starkiller
8 - Algol
WTH I say.
The AI of many a fighting game on high levels is just read/react/punish at processor speeds; I enjoy it for the sake of learning the moves of a chara I don't play but in the end it's worthless in testing your own strategies because in life 50/50 mixup pretty close to 50/50, not 0/100 because the computer reacts "correctly".