I prefer my mechs to be more realistic in size(aside from Gurren Lagann for obvious reasons) which is why I have always prefered shows like Escaflowne for mech fights.
Gundams, though are some of the more powerful mechs in the entire history of mecha, but have two weaknesses.
Their size and the fact that they're bipeds. That alone calls for a strong tripwire or something like that and you could bring the thing down. Orbital Frames would be in your lot since they're a lot smaller and more powerful. (Zone of the enders).
Armored Cores... I guess before 5th gen they are around 40 feet. That's 20 less feet than most mobile suits.
You can't say Gundam is bland compared to other animes due to the amount of series, the depth of the UC timeline and the fact that Gundam evolved the bar for mecha, and defined the real robot genre. However, it's success lies largely in Japan, which is why they won't market a lot of things easily to the US. Wing brought it to America but G Fighter kinda harmed it. Not saying G fighter is bad, but it was a different kind of Gundam. This threw the audience off. 079 was too dated for many as well.
Of course, the main robots in America are Transformers... and I hate them. But Michael Bay raped the series so I feel a little bad.