The mini-series was great.
Season 1 was also great and probably my favourite of the whole show.
Season 2 was great until they settled on New Caprica. Altough in hindsight a logical step the whole "one year later" out of the blue didn't sit well with me because it came at a time were I felt the characters finally settled in and become a nice team like an Enterprise crew only to be broken apart again. Also the whole "they have a plan bullshit etc" was completely interrupted and it felt like watching a different show. It was rather hard to pick up again in season 3 because it really felt like it was over and to me it was hardly interesting what happened on the planet. To be fair, if watched on dvd without a few months break it is easier to watch but quite one of the worst cliff-hangars ever imho.
Season 3 was quite nice when you come to terms with the new caprica arc and had quite a few nice moments. Tigh killing his wife was - at this time - shocking and the Exodus was quite one of the highlights and as far as I am concerned it was probably the last time on the show you could feel good about anything. On second thought it was also very nice that they killed starbuck, at least for a few episodes, it did the show good not beeing centered on....such a person. Alas it didn't last..... . On the negative side, characters are starting to behave erratic imho. Lee suddenly feeling the urge to become a lawer for instance.
Season 4 was not bad but the trend started with Helen is continued to the point that you got the impression they didn't want to pay their actors anymore. Everyone you knew and cared for is either killed off for no good reason or happens to be a cylon. I especially despise the suicide of Dee and the way they got rid of Geata. Their fate would make every red shirt proud but felt very wrong for really likable characters already having survived 3+ seasons.
I'm Commander Shepard and this is my favorite store on the Citadel.