Sounds like I'm going to be the sole voice of dissent, but I think one major aspect of T5 takes BA in TOTALLY the wrong direction.

I start from the conviction that a premium carrier is synonymous with service is synonymous with people, yet T5 is one of the most 'hard', sterile, impersonal terminals I've encountered. Right from the moment you walk through the front door into the vast barn with it's focus on do-it-yourself, though the rigidity of the daft bin system on the screening machines, the 'hose down' style of the "furnishings", the intimidating view down the endless escalators to the pit of the train station, right through to the hardness of the walkway out to the corner gates on T5B there's nothing warm or friendly or welcoming about it. Yes, it may be functional, but it's at odds with the ambience BA creates with it's onboard service, and to my mind at odds with BA's aspiration to be a premium carrier.

Hopefully T5 will soften over time and present a more human experience.