It has a fantastical feel, with fast-paced, absurd plots. Like it's trying to be Black Books or something. I see it as a missed opportunity, but it had its moments. I liked the look, the character, the setting, the premise; it has warmth, heart, and a charm to it. I suspect another series or two would probably sway my fondness higher up a bit.
Having said that, the toilet humor had a real tame feel to it. And the lines felt a little all-over-the-place in comedic style and quality, especially the call center employees' lines. Not surprising when you learn the 7 episodes in the series - excluding pilot - were authored by 4 different people (6 if including the pilot). I didn't like a lot of the operator-to-annoying-Brits gags. The voices on the other side sound too exaggerated and put-on for silliness, which I felt overcompensated for the weaker jokes. But I must state that a few of these sequences I did feel were solidly funny.
Something that has just occurred to me is that it doesn't have a laughter track. It could have helped. (On the other hand, the unfunny jokes would be highlighted as such.) Also, minor criticism, but the incidental music can get a tad grating after a while.
I certainly feel that the series started strong but weakened progressively towards the end. So I think the series would have been improved by reshuffling the episode order, as well as possibly including a laughter track. Goodness Gracious Me and The Kumars at Number 42 had a consistency of high quality that is missing here, the least that could have been done was to swap a weaker episode from near the end with a strong one from near the start.