I find SEA disagreeable with its lengthy journey through the nasty, disorganized lower levels upon return to US soil. Last time I went through, a security screener was abusively berating some poor soul who hesitated in re-checking their luggage (lots of people were unsure what to do with their bags). It was offensive, as the person seemed to take great pleasure in making this hapless soul feel like an idiot.
Recently did MSP int'l arrival for the first time. It was a piece of cake!