indianavex, Let me jump in here, I've experienced the exact same issues that you've listed and even more, when I upgraded my 2009 17" MBP to ML ten days ago. The most alarming issue which had to be dealt with, was no screen (stayed black) on wake. Screensaver stopped working altogether, and the machine was running so hard in sleep mode. I've spent the last ten days scouring posts in Apple Support Communities and Mac Rumors and have tried many of the recommendations suggested. Right now both my 2011 17" MBP and my 2009 17" MBP both using ML are working as very nicely. I say that with bated breath because so many posters have claimed to have fixed issues, report back saying no dice. There are so many varying issues and they are all over the map. There is some consistency in shared problems like: WiFi dropping off, very slow networks, no wake out of sleep, but by in large the range of issues is broad and affects the Apple family of Macs from the latest and going back several years.
I can share what I did to correct the issues that ML created for mostly my 2009 17" MBP. I say that with some reserve because like years and models in Macs don't seem to correlate as you'd expect. First, your battery. Yesterday, my battery stopped charging, wouldn't go higher than 84%. It had dropped down to 18% in no time when I moved it to print a document and didn't connect the mag safe adapter. I have four areas set up in my house to work, each one with a mag safe adapter. Each station is set up with a surge protector and a mag safe power cable. Last night I moved the 2009 MBP to the living room and to my surprise within minutes, the battery reached 100% and has stayed at 100%. This is the first time in many weeks that it has hit 100%. So I unplugged the other three mag safe power adapters and the power strips of the surge protectors, let them sit for a few minutes before plugging them back in. You might try moving to a different outlet, different room to see if this helps.
Last week I did a PRAM and SMC reset, which did nothing. I rebooted the Ubee modem and Time Capsule, no change. These are the steps I took to get a good working solution, thanks to the culmination of reading so many posts and trying the steps suggested by seasoned users.
First, Changed Energy Preferences to: longer battery life, Unchecked Wake for Network Access, put the Computer Sleep to never, the Display Sleep to 7 minutes. Opened Preferences; went to screensaver preferences, chose National Geo. pictures, instead of my own photos. Set timer for 5 minutes. Restarted MBP.
Opened Disk Utility: ran Verify Disk Permissions, Repair Disk permissions, Very Disk and Repair Disk for both the Macintosh HD and the Media Drive. Restarted MBP. At this point I could wake the MBP and the screensaver worked for the first time. I stood very close to it most of the day. Previously, I had been using the power Off/On as a means of getting a screen at all, my only means of getting it out of sleep mode. And we all know how bad that is to do.
Then, I reset and rebooted both the Ubee modem and Time Capsule. I created a new 5MHz network, using WPA/WPA2 personal security. Then chose the option to make a guest network, chose WPA/WPA2 personal security. Restarted MBP.
Then, Opened Preferences, clicked Network, my new 5GHz network was in Network name. Then clicked Advanced. Under Preferred Networks I deleted all the old networks except my two new ones, the 5GHz and guest network. Made sure the 5GHz network was on top. Restarted MBP. Checked again,to see that the networks had actually been deleted from Network preferences.
Then, Opened Key Chain: Made sure the new networks were in both Login's and System, and that the new Time Capsule (disk and application passwords) were there. I deleted all the old WiFi Networks and old Time Capsule (disk and application) passwords in both Login's and System. Restarted MBP. Went back to Keychain to verify the change. Some had not kept my changes; I repeated the same deletes again. Restarted MBP, checked Keychain again.
Then, back to Energy Preferences, and took the Computer Sleep off of Never, and set it to 15 minutes. Important: That is the only change made. Did not recheck Wake For Network Access. Restarted MBP
Last step, Opened Disk Utility, and went through the same steps as before. Restarted MBP.
Both MBP's run beautifully, going on four days now. This is interesting. I have never experienced my 2009 MBP to run so quietly, EVER, especially in sleep mode.
I hope some of this might help you. These posts are awesome. I leaned so much from the seasoned users, and appreciate so much the time that so many fellow users have taken in helping others. This is one really good thing, in a very disappointing ride with Apple on the unfixed and often denied glitches and bugs that Lion and Mountain Lion have come with.
