To put it straight the most interesting part of Nagisa is her parents. Due to Nagisa being so boring frankly you don't give a sh*t what's going to happen to her play. Her whole personality is a cliche and a boring one at that being 'I love everyone around me and completely lack confidence' she adds no comedic value nor is interesting. Her character is interesting up to episode 4. The ending'arc' with Nagisa is probably one of the most boring things I've watched. But generally, that part of the story is ok. Yet the ending or explanation kinda came as a surprise and you don't get to see the family. Tomoyo's part (probably the most interesting) is good and the character is well introduced and likeable, her ark is the one that felt closest to me. Basically you can watch it and not feel to bored Her character is somewhat interesting once again being comedic yet her arc focuses more on the feels side. It's passable as interesting yet isn't memorable. Kotomis arc is probably the most standard one. However, past her arc, her skits in the rest of the anime are boring, cringe and make her unlikeable The actual wedding itself you get attached to a little but you mainly watch it for the comedic aspect Fuko brings. The way she talks (at least subbed) gets annoying after a while too. Starting with Fuko, though you may call her cute and 'funny' her addiction to starfish and her 'lost in cuteness' thing gets repetitive and boring and in general she has a mean attitude to the main character for most the anime. Starting with characters and story, the story can seem like a long drag for most the show, with four major plot points being Fuko wedding, Tomoyo student council and the play. Bearing in mind I haven't watched after story,(Minor spoilers)

Clannad movie summarise the show