Yes, Hard CC champs do pose somewhat of a threat, but you are also dealing with 2 other champions. Unless your entire team has hard CC, I don't see it being that big of a problem. If you pick Zyra, for example, you might be able to stop Tryndamere for a brief moment, but that's not going to kill him. Hexdrinker usually prevents an AP's burst and with his Ult and Q he can pretty much be full health again immediately. Dealing with a Carry? Randuin's Omen, like Anders said. He can pretty much counter your counters.