Whispers - meh, 'twas okay, though kind of one off-ish in that annoyingly random way that SGA sometimes does things.

The Queen - pretty cool idea, weird execution, possibly because it's mostly setup for what's coming now.

Tracker - can't comment, didn't watch it

First Contact - 'twas good, scifi instead of love triangle. Lotsof everyone being competent, which is always good.

I dunno, I'd keep going (obviously, since I am) but it depends on what you're looking for in your episodes or why you stopped watching.