I know that anti aliasing ist the process to prevent the staircase-effect. It can make graphics a lot better but it can make sharp pictures become unsharp. Is antialiasing worth? It consumes a lot of grafic power and doesnt always give better graphics.
It's all preference. I know a lot of people who don't use it and enjoy games perfectly fine, I also know people who need to use SSAA (which is very taxing) in order to be happy. Me personally I'm usually happy with 4x MSAA in most games, but there are some games where i just require SSAA (games usually with a lot of foliage).
I do play same games with AA off or MSAA 2x, that require absolute screen clarity, such as FPS games.
antialiasing is a software technique for diminishing jaggies - stairstep-like lines that should be smooth. Jaggies occur because the output device, the monitor or printer, doesn't have a high enough resolution to represent a smooth line. Antialiasing reduces the prominence of jaggies by surrounding the stairsteps with intermediate shades of gray (for gray-scaling devices) or color (for color devices). Although this reduces the jagged appearance of the lines, it also makes them fuzzier.