Now I could blame a lot of poor booking of various wrestlers in WWE as a lot of people have been brought down by WWE booking. However, most of the poor booking could be attributed to Vince always trying to put his talent in positions that make them look weak and uncomfortable. Numerous former NXT stars like the Ascension and Neville were poorly booked upon their debut on the main roster, and even though Neville has been booked amazing we can't say the same about the Ascension.
Though Triple H really hasn't had much to do with the booking of the WWE main roster, but there were some talent that Hunter has had a hand in booking. However, we have heard that Triple H had a hand in the initial push of Sheamus when he debuted on the main roster. Sheamus at first was booked as a monster like always for someone his size and though Sheamus was needed on the top of the card, but was he rushed to the top or did they do it right. Well fact is Sheamus never really was given the keys to the castle and always had the rug pulled out from under him before he could really gain some momentum.
Though some of Sheamus's early feuds did include a program with John Cena and Triple H. The booking for these feuds wasn't very good because the first big win for Sheamus came against Cena in a table match which meant that he didn't actually pin Cena to win the World Title. Then Sheamus would come up short against Triple H at WrestleMania and these two matches ending the way that they did played a part in Sheamus losing some shine very early in his run. But it's pretty clear at this point that the WWE has gotten the hang of booking him since the start of his team with Cesaro.