I mean that completely and entirely. You're going to be very disappointed if you expect a show that will take you to the ends of time and space and show you what you've always dreamed of. For a show that, during its time, shook its industry, this may be off-putting.
Lucky☆Star-- the show that you'd recommend to many but can't due to being unable to find the unicode star and just use a space instead (I will be referring to it as Lucky Star because I can't find it either)-- is a show that I thoroughly enjoyed in and out. Cute girls doing cute things aside, Lucky Star absolutely changed how I perceive this genre of anime.
While it may be easy to write this off as a show that had minimal effort with its repetitive humor and dull moments, I believe this show both is not to be taken seriously, and at times, doesn't even take itself very seriously-- the only continuation of any plot whatsoever would be obtained from each episode's iconic style of conclusion, which even then is a reference to a past endeavor. Kyoto Animation took a no-holds-barred approach to this show's amount of humor and references.
So, what do I mean when I say not to take this show seriously? Like I mentioned, this is a show that changed how I look at these slices of life, arguably for the better. Coming into Lucky Star with expectations of an overarching plot such as K-On! will leave you somewhat dazed. Instead (and I am by no means the first to look at it this way), consider this show a form of popping by your new friends and seeing how they're doing.
I understand that sounds weird, and those new to anime in general would consider that the hole they don't want to fall into, but I stand firm in my belief that this show was meant to show you the lives of friends living out their time in school in an (arguably) normal way. Normal lives don't consist of making it big early on or meeting a destined partner after years of being separated-- at least, not entirely. Normal lives consist of a few basic ingredients that Lucky Star replicates almost perfectly.
The show's comedy, repetitive as it is, almost exactly resembles that of a group of friends with their inside jokes and running gags. The show's dry moments show you that not every second of life is spent running around doing something important. The show's moments of clarity and entertainment-- going to a beach, a festival, or whatever else have you-- mirror life's peaks, those spent with friends and loved ones.
In conclusion (of a review that went everywhere randomly), this show's perfect adaptation of a real world make it absolutely enjoyable. Lucky Star truly understood what a slice of life is: not a semi-realistic group of people who will occasionally make you think, "wow, that's totally me!", but an entirely realistic group of friends who will constantly and consistently make you feel like they're a real entity. Of course, the colored hair of the protagonists isn't becoming a natural reality anytime soon.
But who knows? Maybe they're out there.
Post statement: There are times when the "realism" card gets tossed away and replaced with a more humorous element, in references to other works of anime or manga. You'll definitely know it when you see it.
