Bit of site history:
The first Series Guide was Series 2, followed by half of Series 3. The rest of Series 3 then Series 1 followed, followed by Series 4-8.
The reasoning for Series 1 being like a 'walkthrough' was that since it was a short series, it could be done in a reasonable amount of time. Also Series 1 was so unique/special/rare being the first ever series, I thought it would be good to go into full detail.
Ideally I'd like to have both formats for all Series, but to be honest it isn't going to happen. It took several entire weekends of solid work to compile a series guide, working very late, and there isn't the time anymore.
Of course if someone wants to do it then then I'd be most willing to include it.