Unfortunately, the title of this thread conflates three separate things and creates a giant straw man.
Kyrie does not suck. He's a super-talented scoring guard.
Hayward does not suck. He's a super-talented all-around wing.
The trade may or may not suck. There are a lot of variables that have to play out before we'll know. Here are the basic possible outcomes:
Negative a) The trade will suck if Kyrie simply doesn't work out for whatever reason (injury, bad chemistry, whatever).
Negative b) The trade will suck if Kyrie is no better than he already has been and any of the following happen:
- Isaiah returns to close to full form and helps 'Bron get back to the Finals. 'Goes on to play at a high level for the next few seasons.
- The BKN18 pick turns into a super-stud (via draft or trade).
- Zizic turns into a stud (less likely but possible).
Positive a) The trade will win if Kyrie is no better than he already is but all of the following happen:
- Isaiah never returns close to full form. Or he does, but then fades quickly.
- The BKN18 pick doesn't turn into anything special.
- Zizic doesn't turn into anything special.
Positive b) The trade will win if Kyrie elevates his game to a new level above what he has played at so far.
In short:
It is definitely possible to think both Kyrie and Hayward (who had nothing to do with the trade) are great players (who don't suck) and still think the trade was a super-risky overpay (i.e., a "bad trade"). It all depends on how you feel about the probabilities of all the different outcomes.