JT, the man who joined Chelsea at the age of 14, came of age under the guidance of Marcel Desailly. When Desailly left the club in 2004, Jose Mourinho handed the captain's armband to the leader of the team, John Terry.
A very smart decision.
Since then, JT's performances have been almost impeccable for his club, and very underrated for his country. One or two average performances here and there, but generally excellent. Whilst his former CB partner, William Gallas was constantly made a fool of by Thierry Henry in the battles between Chelsea and Arsenal, JT always seems to have had the upper hand on almost everyone he's played against. Ever present in the team which is probably the best defensive side in Europe, Terry's leadership skills were acknowledged by new England boss Steve McLaren, who also made a smart move in appointing JT as captain.
Nevertheless, back to the subject.
Terry's awareness and reading of the game reminds me of Liverpool legend Alan Hansen. Lawrenson was the one with the pace, but Hansen was the guy who tended to be exposed the less. The one the strikers targetted the less. Same with Gallas for Chelsea (now Carvalho) and Rio for England. Terry's awareness is almost certainly what makes up for his lack of pace, and it's why very few strikers (including Henry and Eto'o) have been able to go past him. Very physical too and extremely dominant in the air (interesting match between him and Drogba at the training ground I'm sure)
England is fortunate to have such a talent. A player who gives 100% and will never accept defeat.