Yea, i understand your frustration with the flying mechanics, it needs a little fine tuning but it is the Tt's first time of free roam flying, I am sure they will have almost perfected it in the new marvel lego game.
I've heard that there will be free roam and also if your Iron man and you fly to the stark tower in New York and move near the pad it skips to an animation where he lands on the platform and the suit is taken off him and visa versa if you walk on the pad as Tony, which I hope is not a dud rumor, 'coz I am really looking forward to doing that.
Hmm, well I would have to say I am excited to play as Stan Lee, which will be awesome, but I am pretty happy with the character line up so far, I think you might be in luck in terms of a cross over as I have heard that both marvel and DC are now owned by the same license, but considering there will be over 100 characters already, if they do give you the opportunity to bring back some DC characters it will probably only be the main characters such as batman and superman.
By bridges you mean those green gates right? Well if that's what you mean you have to unlock superman in free roam and laser vision the locks near the footpath, hope this helps. Btw what console are you using?
I thought the same when i first played it, but armor is like damage resistance rather than a shield, so for instance if you get a fire ball thrown at you with no armor you'll loose, say 10 hp, now if you have full armor which i think is around 125 depending on your console, the fire ball may take off 5 or so hp and you will loose a few armor points, hope this helps