First, for the record, I loved all three movies. Thought they were great fun. Looking forward to the rumored fourth.
Now, having seen the first two episodes of the series...
I have to say, meh.
It's not awful by any means (assuming you want something in the same vein as the movies). But it's nowhere near good. It's going firmly on my "If I'm home on Fridays with nothing else to do, I'll watch it, but I'll make no effort to record it" list.
And yes, it's a monster of the week show. They established that in the second episode. (BTW, was it just me, or did the second episode seem really choppy? I mean, a few major plot points--such as they were--were introduced in dialog as though they'd been discussed before, but hadn't been. Bad editing, maybe?)
All in all, it's not nearly as good as the movies were. Kinda fun and mindless, but that's the best I can say for it. Those of you who are planning to avoid it--well, honestly, you're not missing much, though you may want to give it a try some Friday when you're bored.