Maggie MMG versus Ls3/5a

… Mapman says MMG are good on transients and attack, but Polarin says they are not great for rock because they lack weight and dynamics and Rpfef says they have greater impact (than the LS3).

How do I tie these opinions together to get an overview...?

Add a subwoofer or the DWM panel.

Then you'll get transients & attack plus the bottom end drive you need for rock and pop. I'm using a pair of small fast subs with my Maggie 1.7s and they pretty much cover all genres of music. If I need more slam for synth-pop and heavy rock, I would just swap out the little subs for bigger and deepter ones.

If the Rogers you heard did not present a deep and realistic soundstage they probably didn't have the proper electronics.

To clarify: I meant that at the time I auditioned the Mags vs. LS3s, I found the greater radiating surface of the mg1s and their ability to play louder made larger scale musical forces more immediately physical in their impact. I guess, for electric guitars and drum kits, neither option suffices to give a great rendering.
I thought both designs had about similar detail revelation and transient attack. The 'tiny' drivers and the little box make a satisfying job of quickness surely not very different from that of the planar designs.

Difference between soft and loud and dynamic range.

I see my response has garnered some comments... First of all if I could have numerous systems throughout my home I would undoubtedly have a dedicated room for Maggies, for late night Jazz listening I can think of no speaker I would prefer over them. That said I am not in a position to realize that pipe dream so my family room speakers need to perform well with all types of fare (including movies) and for me Ohm Walsh 3's fit that bill nicely.

Maggies possess a magic about them that is hard to compare to a dynamic speaker, I've seen lifelong audiophiles come unglued from hearing them for the first time. They have such a naturalness and uncolored way of projecting sound that other speakers will sometimes sound "broken" after hearing a well setup pair of Mag's. However their limitaions are distinct, a VERY small sweet spot, the need for gobs of current, correct placement is critical and again they will simply not blow your hair back on hardcore rock.

Those willing to give these speakers what they need in terms of upstream components, a proper room setup and the right genre of music will be rewarded with a sublime musical experience.