Yeah Tennant can get a bit boistrous... but it works for him. Smith can to an extent, but in many ways he almost feels like an older Doctor even though his actor is far younger than most of the Doctors. Says 'shut up' too much lol.
But it's kind of interesting watching all three of the modern Doctors, you sort of see traits and quirks from an earlier one in a later one. It does feel like it all flows together nicely.