I'd say, VP$IP below 20 is tight. 21-35 or so is semi-loose. 35-45 is loose. 45+ is more often than not donk.

Agression is easier.. >8-9 is aggressive, below is passive preflop.

28/15 would be SLagg. It is definately NOT Tagg, but not quite loose enough to really be Lagg. Incidentally I run at this.. 30/15 or so. But it vastly depends on my mood. 22/10 has happened over long stretches, also 30/10.. etc..