Honestly, I absolutely loved my Performa 450, which I upgraded to an LCIII by installing a $19 FPU. I used it for 3 years, without a single problem, constantly keeping updated to the latest OS, customizing my UI up the wazoo... everything. The pizza box design was gorgeous at the time. Performas have a bad name now because of the history of Apple, but those machines really worked.
My most hated mac was my TiBook 400. It looked so gorgeous when it was new, but once that paint started chiping, the screen started getting permanently marked by the keys when it was closed, and finally the plastic started crumbling apart, I was heartbroken. The power cord also became frayed and had to be replaced, TWICE, and the battery was at about 25% of original capacity, all within 3 years.
My white MacBook had similar problems, and the battery grew to 2x its original size, cracking the plastic in the process.
Now, my Late 2009 MacBook Pro is awesome. This is now my favorite Mac ever. It still looks brand new after almost 2 years, and I expect it to last at least another 2.