Ok, it's hands down the best action TV series ever, but there are some caveats that must be mentioned
season 1 is the only one that really sticks true to the "this is happening in real time" aspect. As a result it is also the most boring season because it drags out what is happening. From season 2 onwards a lot more happens each episode but you have to suspend your disbelief because they really exaggerate how much can actually happen in an hour. Everything that happens in season 1 would only take about 5 episodes of any other season.
season 1 also has the most insufferable side characters who do the dumbest shit ever.
season 2 makes a big jump in action but also a big jump in violence and torture. From season 2 onwards, Jack is a super action man and occasionally crosses the line.
some of the early seasons dip into "war on terror" territory. It's not explicitly right wing and Jack definitely doesn't come across as right wing, but there are some questionable themes.
Ricky Schroder shows up in season 6 as a guest character.
so yeah, if you can look past these things it's good action tv with lots of twists and turns. But It's dated.
Homeland is less action oriented but deals with similar themes and is generally a better show, but if you are just looking for some make believe action with plenty of high stakes twists, 24 is enjoyable schlock