Yes, wagering is the key. So I personally read the terms and conditions even before considering any bonus promotion. And if I see that the WRs are not affordable like 50x+ that you can find in some online casinos, I better skip this promotion than engage.
Without a doubt this is important after all it is not rare for people to disregard everything as long as they see they can get a significant bonus, however wager requirements are really important since there are some bonuses from which it is almost impossible to fulfill the gambling requirements, in which case it is better to just skip the promotion regardless of how substantial the bonus may seem to be at first sight, however many gamblers even when they know this information have problems rejecting such offers even if they know they would be better off by doing so.