I'm assuming you mean the manner in which they left in the Summer?
I was more bummed out by Nasri leaving than Clichy if I'm being honest, mainly because I've always been a fan of Samir when he was playing in France and earned the "New Zidane" moniker, and was pleased as punch when he signed for us. Last season for me he was only beginning to scratch the surface of what he's capable of as a player, and what annoyed me is that I'm not convinced he'll achieve that at Man City. I think Man City will definitely win trophies and he'll be a part of that, but I can't see him being the player they rely on when they have others in their ranks that already hold that role. With us, he might not have won the league immediately or anything but I think he would have really flourished with us. At Man City it's so uncertain from one day to the next whether or not he'll even start, which is why a few people disingenuously call him one of the mercenary types we see nowadays, following the money as opposed to the football if you like.
Drawing a parallel, it reminds me of what happened with Shaun Wright-Phillips before he signed for Chelsea. He was a great talent and destined for big things, but he stagnated more or less the entire time he was there. Sure, he has a few winners medals, but he's never going to be considered one of the all time greats, whereas had he signed for someone else, maybe Liverpool or Spurs, he could have developed his game a bit better.
As for Clichy, I honestly could not care less about the potato headed gimp leaving. When Cole left us, he had a good couple of years where he was really trying and developing his game, but then all of a sudden he stopped and it was like he was just going through the motions. Maybe it was an issue he had at the club though as he's not doing too badly at Man City, but with us he was always making mistakes, dwelling too long on the ball, not completing passes and going too far forward, so in that respect I can't say he's been a massive loss.
It's crazy to think that Man City have given us more than £75m for 4 players, and really the only one who I think has been missed has been Nasri.