In tournaments, you stick with the players that got you qualified, it's only fair. During 10/11, Downing had a very good season for Villa and that persuaded Capello to bring him in. On the basis that he helped us qualify, I don't begrudge him his place. You can't blame Capello for not anticipating Downing's poor season and it's only right that Roy does right by Capello's team until after the tournament when he is free to make his own decisions.
Carroll is only 23 and like it or not, he'll be a central figure for the next 4 or 5 major tournaments. He might not have had a great season, but he is undeniably a good player who will be with us for some time. Grant Holt has had a great season, but he's 31 so won't be around much longer in international tournament terms. If Roy thinks he'll be a Teddy Sheringham and carry on forever, then let him show it after the tournament.
We must remember that Capello got us qualified and a complete overhaul of his team immediately before the Euros would be disasterous.
The only real surprise inclusion for me is Alex Chamberlain. That's a good gamble for me though as the kid has a spark of explosiveness and flair that many England players lack. Coupled with his determination and youthful exhuberance, I do think he could be a breath of fresh air and possibly even a difference maker.