Mielonen grew in height early and could always skate well, so he was a core player for junior national teams and a solid prospect for quite some time. His career reached a high point just at the right time when he won the Jr A Finnish championship and was Finland’s best defenseman in the U18 WC as his last deeds before the entry draft, although as an unspectacular player he reached headlines during neither campaign.
Mielonen suffered an injury in 2005 which limited him to 23 games last season. He registered three points in six games with Ives Tampere of the Finnish Junior-A league and an assist in 17 games with in the Finnish elite league.
Gaining mass is something Mielonen hasn’t tried successfully, but he is still deceptively strong, more so than his heavier peers. His physical play is thus a question mark but a somewhat positive one. He won't improve much at mobility anymore, which is mostly a compliment to his current ability. His puck skills are up to the tasks he is given - a power play specialist isn't among them, though. Mielonen is nearly always the more defensive defenseman of the pairing.