United's front entrance / Matt Busby way is pretty impressive (imo), but the rest of it clearly shows years of upgrades upon upgrades and looks pretty poor all in all. Yes, it's a large stadium, but in reality, it's far from a great stadium (architecturally). Inside (concourse) it's typical of most grounds, further inside, it's pretty impressive as an empty stadium, but the seating is cramped to say the least.
We simply have a far more impressive stadium in terms of design and build, but you'd expect that with a modern stadium. By that measure, the Reebok (as was) is a 'better' stadium than Old Trafford.
It would be churlish to deny that Old Trafford isn't about ergonomics. A lot of history lies there, and it's impressively large.
I still feel City could improve the external appearing of the stadium to be more in line with the modern look of the rest of the campus, but it's a minor point really.
It's horses for courses really - Some like Villa Park (or certainly the steps leading up to it), and some like Fulham for the old feel... but we have a modern stadium, and I feel it should reflect a modern thinking club too. That's not to ditch the rest of our history, but simply mark where we've 'been' in contrast to where we are now, and where we're heading.
Tarting up the outside to reflect the slick / polished feel of our club would be a fine move imo.
The bigger problem for united and OT isnt so much the general seating and concourse but the quality of the corporate offering.
They are about a decade or more behind in how they shmooze, wine and dine and most of their corporate stuff is not much roomier and special than City's normal level two offering.
I used to go to OT often as part of a corporate requirement and even the clients at the time used to make mooing noises when herded to the food and bars.
If you will forgive me a rather broad generalisation here City are Sainsbury through M and S to Selfridges food hall whilst united are Iceland, through Tesco to Sainsbury.