Excellent idea to weigh differently in each category.
Audio:
- Does Audio mean
(a) local music&game speaker/headphone only,
or does it include
(b) telephone call clarity/loudness
(mic and speaker/headphone, when used as handset or as speakerphone or videophone)
?
[If the latter (b), a weight of '2' for smartphone Audio seems low.]
- Would speech input fall under Audio? Or is it too rare, so only Impression?
Temperature:
- Why is temperature weighed higher in desktop/laptop machines (office, multimedia)
than handheld/pocket machines (smartphone, tablet, convertible) ?
[You already have a separate system noise rating and a performance/throttling rating,
so the temperature seems important only for workers who use intensive programs while it
runs on their lap, maybe only those who commute on the train with an electrical outlet.]