*shrug*
In my experience, there are different types of tables.
At some, players appreciate combat after combat, and enjoy playing around with all the fiddly bits. And the person who best fiddles with fiddly bits is a good player.
At others, players may not appreciate entire sessions devoted to tactical combat.
What makes a good player therefore varies from table to table. A person who is a good player at the first type of table might end up thinking he is still a good player at the second type of table, and wonder why the rest of the group needs to have a discussion with him after the game about table etiquette. YMMV.
In the end, a "good player," is just a player that helps maximize the table's fun, however that table finds its fun.