Chelsea paid £50m for him which made very little sense given he hadn't looked the same ever since a knee injury 8-9 months beforehand. Some thought it was him just being a sulky twat at Liverpool after Rafa left (he was being a sulky twat tbf, but that was a side issue as it turns out). Around 2008ish he had a decent claim on being the best out and out centre forward in the world. At times since he's looked like a League One player, his general play is awful let alone his finishing which is laughable most of the time nowadays. He does try but he's been done for a long time. By rights Chelsea should have got rid a long time ago but hard to find takers with the wages he was on, plus Abramovich was desperate to get it to work, he'd already had one vanity purchase in Shevchenko go horribly wrong and he did everything possible to try not to make it a second. Even going as far to appoint Rafa, knowing it would really piss the fans off, knowing he played pretty shit football, all to appease Torres and try to get the best out of him. I'm convinced they let Drogba leave for similar reasons, reckoning they had to make Torres the clear #1 to get returns from him - still didn't work, he was rubbish.
Liverpool could have laid claim to a great deal....if they hadn't then gone and lamped £35m on Carroll.