Bob... while I am really looking forward to a big two-hour eye candy explosion that will be a blast to watch,(I'm going to the next show in a few hours)... I have to say that comparing it to Independence Day raises a giant red flag.
Independence Day is quite possibly the absolute worst big budget spectacular I've ever seen... unless you count anything else that hack director/schlock master Roland Emmerich has ever made. ID4 hinges on plot points that pass the line of stupid by a mile, and coincidences that would make Victorian Romance writers blush.
I don't need my movies to be dark and brooding and to grapple with weighty dramatic issues... though I do love those movies. Movies can be simple and airy and stocked with humor, but even in the obviously unrealistic world of scifi/fantasy action, I can be ripped out of suspension of disbelief when a movie decides to break its own internal logic and reality with this that make no sense in any version of reality... like defeating the aliens with a virus uploaded from a Macbook or Will Smith's stripper girlfriend just happening upon the stranded First Lady then leading the refugees to a secret government base she couldn't possibly know the location of. ID4 is a cavalcade of dumb followed by dumb.
I'm still pretty pumped for Pacific Rim... and I don't expect it to be Aaron Sorkin Smart and Christopher Nolen gritty, but I do hope it creates an internal logic for its world's own reality, then lives by its own rules. If it does that, which ID4 did not, then I'm going to enjoy the hell out of it.
I am, however, heartened and reassured by what you said out the characters being well fleshed out without burdensome expositions. Del Toro is a smart director, and Emmerich is not, so my hopes are still high.