as i interpret this..."screen door effect" means visible pixels...respective the room between them..and making the screen look like..uhm...a "screen door".
My set is 720P and i cant confirm this at all...sure not for watching content...and also not using the set as a monitor...besides issues like slight "grain" (now compared to a monitor)....
As i mentioned on various places also...also over on AVS...1080p is a nonsense which VIRTUALLY and LITERALLY doesnt show any beenfit over 720P...maybe if you go 60" and bigger....but IF then it's so marginal that its a non issue.
Also..the thinking "i need 1080p" for using a set as monitor might be a fallacy...that is...EXCEPT you have some SUPER set-up in SLI with two 8800GTS or soe other monster graphics cards....to even THINK about using 1920x1080 as a gaming resolution.
Different story if you do NOT game....and just really, really need this resolution for applications/desktop.
This said..again...even with "only" 1360x768 i think my 720p sammy does extremely well as a monitor..no "pixelation" or obvious SDE....also coming from me as a plasma noob EXPECTING to see each single pixel on such a huge screen.
Add:
Reading over at AVS...and observing my own 50" set...."minor" so called "flaws" here and there....like dithering etc....which AT FIRST seem odd if you're only used to a MONITOR....but all those "issues" are virtually non-existent if you use the screen in normal viewing distance, say 5'-6'.
People look at a 50" screen from 10" difference and see "flaws"...and then they post in various forums about their findings....but a 50" is certainly not meant to be watched from 10" distance
As for the various display technolgies, Plasma, LCD, DLP, etc..etc....yes you can spend months and you will always have a guarantee that EACH of those techs will expose ONE downside which is inherit to the tech used..be it Plasma, LCD, DLP.
One technolgy has the better blacks, the other shows fringing...the other tech has lag....or "trails"....the other has image retention problem....this goes on forever. The best choice is really just enjoy the set and NOT expect that (at current) there is the PERFECT tech out without ANY "flaws" or side-effects whatsoever. That's just not the case.