"The first year with a new team is always a little bit tricky," Button said. "It's a new experience for Lewis. I'm sure he's excited about it.
"He's as quick as they come but sometimes it's not that easy to win grands prix and to build a team around you and also to help a team achieve great results."
Mercedes started the season strongly but have fallen back dramatically since F1's summer break.
The Brackley-based team have failed to score any points in the three races since Hamilton's deal was announced, but the 27-year-old said he had no regrets about his move.
Lewis Hamilton - the McLaren years
"It doesn't worry me," he said. "I'm really excited to go there. I feel fantastic about the decision. I'm massively excited about working with new people. It is a fantastic team. I know they have lost their way a little bit at the moment but I'm going to go and help them find their way.
"I already knew how big [the task] was. I really thought about it hard, and I could see how big it was. Perhaps it's growing as a task, but I'm excited about it."
Abu Dhabi Grand Prix 2012, day one
Friday, 2 November: First practice 08:55 GMT; 5 live sports extra, red button and online. Second practice 12:55 GMT; 5 live sports extra, red button and online.
Abu Dhabi Grand Prix 2012, day two
Saturday, 3 November: Third practice 09:55 GMT; 5 live sports extra, red button and online. Qualifying 13:00; BBC One (from 12:10), online and 5 live sports extra (from 12:55).
Abu Dhabi Grand Prix 2012, day three
Sunday, 4 November: Race 13:00; BBC One (from 12:10), online and Radio 5 live (from 12:55); Race highlights 19:00 BBC Three.
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