We have stayed at the Poly quite a bit and like the resort quite a bit. The quality problems in the past with the resort seems to seems to have been rectified. All the lodges have been update and freshened now so they are in top shape.
IMHO it is the only decently priced lodge to stay at when you do not have your own car...the monorail is at your "front door" - that takes care of two parks...the TTC is within easy walking distance and that basically takes care of everything else... grab a direct bus and away you go. The GF - however nice is way overpriced

and the Contemporary - even though on the monorail - you cannot walk to the TTC - however you can walk to MK. Also one of the premium shows is at the Poly - so that is a walk to event as well. Then of course the little transpo boats run so often that unless it is really cold or rainy they are quicker to take then the monorail.
Captain cooks is convenient and never too busy and none of the lodges are really that far away that you can't truck the stuff back to your room anyway.
Now as far as what level to stay at ..we have stayed at all levels except for CL..You have to try lagoon or Disney view at least once..then once you have, stay garden level and save some money...
Now as for lodges, there are lots of threads in this site with opinions on the best lodge..I guess it all depends on whether you are able to walk a bit - how close you want to be to the volcano pool and the noise etc...download a map and check out the areas..
My only suggestionis to stay away from the Rape Nui - Garden view - parking lot side..if you get stuck with that at check in refuse and ask for anything else..the parking lot is noisy- especially on the mornings they pick up the garbage at 5 - 6am and the monorail at times sounds like it is coming through your room ( it passses by the upper floor windows).
The best garden view we have had was Tokelau - garden view - first floor - facing towards Tahiti/Rapa Nui...the room doors open on a large grassy area and a mini planting area - very nice and quiet...