I love the game and am arguably in the minority that will play in the EIHL. I'm from the UK so play this league from time to time.
But, after recently starting a new save I've found a handful of things that annoy me with this league. First is teams seemingly playing multiple games in one day (see here -
https://imgur.com/a/7l0KodM). As you can see my team has 5 games in 1 day! Madness (4 on the calendar in the corner which doesn't include the game on the calendar). Also the EIHL play back to back games every weekend with a game near enough most Tuesday/Wednesdays, again this isn't replicated very well. Cups are not very important in FHM but the Challenge Cup has no depth or coverage to it at all. Games are played and there is no information about (unable to see cup fixtures, past winners etc). I don't believe there are options to have Two Way Deals with players from the league below, NIHL. Also FHM seems to favour the Conference Leagues of the EIHL over the league table when in turn the main focus is the League and very little interest in the Conference league side of things (which is shown on the loading screen when simming days).
There could be more but for now that is all that I have found annoying. Mini rant over and don't want it to sound negative but I'm just guessing as it's a 'small' league the research/information etc of the league isn't that worked on or prioritised about. I just want the game to be the best it can be and as detailed as possible.