We?ve played Legions Imp a lot - and enjoy the flow of the game. We have very much treated it as the latest iteration of the Epic series of rules.
Some comments on the rules
1) The points are all over the place. Infantry are super cheap, aircraft are all basically 100pts irrespective of their weapons load out, titans seem poor value, drop pods are super cheap, etc etc.
2) Dedicated Transport rule is total nonsense - it just allows exploits of walls of Rhinos to block LoS, Rhino drive by attacks, Rhino charges. All of which by models that have no effect on break point.
3) Imperial Fists Blaster Drill - why does this apply to Missile Launchers, makes it the best faction rule in the game. (I owned Imp Fists long before LI was a thing)
4) Weapon stats, these are just too fiddly for the scale of the game, ranges are all over the place, consolidation to 6? bands would help. There are just too many weapons on some vehicles which make in painful to work through shooting. Too many weapon special rules, many of which are similar or trivial in effect.
The good is that the turn sequence avoids alpha strikes, and you can get loads of toys on the table

And we have been playing with army lists to get Tyranids and Squats on the table too