As with all this stuff, I think it's a matter of perspective, priorities and money. Honestly, I think UA is trying to fix the right stuff now. Whether it's the time warp experienced in the sUA 767 economy class, some tattered lounges system-wide, there's only so much money.
While I lament the progress of the lounge rehabilitation (particularly for someone who has shifted his international flying from EWR to IAD). I'm glad they're doing it, and doing it in a way that doesn't jeopardize the financial stability of the airline - as prior management of both CO and UA did in the past.
Quite honestly, I find this lounge comparison talk somewhat hilarious. Ever been to the LH lounge in Milan? Yuk. Huddled with people standing in the aisles trying to balance their breakfast in the Star Alliance lounge in LHR? Again, it's all a matter of perspective, priorities and money.