They nerfed it? To how many?

Probably not then. Depends on the end rates but wouldn't be surprised they increased the chance to fall on rainbow magatamas. That combined with nearly useless tactics is too risky if you are not a spender.

Wait for the feedback from other players and if it's good do it for the last 3-3 days of the event

I just did the event and got the tactics. Everything on the wheel except for rainbow mags is worth more than 100 coupons so it's still an excellent event and a must spin for the 100 try