How I Met Your Mother is probably the best crafted show on television atm. Once you rewatch it two or three times (as i have because I'm an addicted moron) then you can see the creativity with which the producers develop this continuity that hooks everyone who watches it.
The 'Mother' mystery is the best central storyline I've seen, and judging by the amount of theory sites; others agree with me, and it taps into one of the strongest and most sought after emotions experienced by mankind: love.
The acting is outstanding throughout the entire cast led by the Fantastic Five - special commendation to NPH - and the script is hilarious.
People always say that it has copied Friends but, even if it has to a certain extent, HIMYM is in a completely different class to it.
It's Legend-waitforit-dary.