To scratch the surface, I would like to see...
there has to be more options on your D-pad for backline movements. i.e, left once is a decoy with a second man option forward run, 2 clicks a sweeping backline movement with key players in depth etc. players need to be programmed to be in the right position.
gameplay in general has to be an improvement. better running, better tackling animations, better AI and user defensive structures. it looks like the u12s are playing with all the holes that are there/created. I think this is fixed by compressing the defense and making passing slower and making the defense move sideways more than forward and backward.
the players in comparison to the field in RLL2 looked small. make the players in scale with the field.
have a ref on the field with appropriate animations.
intercepts has to be toned down if not removed although if it makes it easier. This will be helped by the D pad selection of backline movement as players will be running from proper depth and making sure theres a good balance between the defence moving across and forward.
fending needs to be toned down, stepping toned up a bit.
AI has to be smarter, more skilled, better at running roles and playing field position.
Goal kicking has to be completely re created and re thought. it was WAY too easy in RLL2. and not every kicker hooks the ball like that...
stamina needs to be fixed. in RLL2 forwards and backs lose stamina at the same time/pace. why have a stamina stat if it isn't going to make a difference.
actual player progress in career.
a more realistic transfer market experience. with the ability to sign players to long term deals etc.
more lively crowds and animations of crowds. if you make a line break crowd gets louder, not just after scoring tries.
Tone the kicking down, the ball shouldn't bounce 25-30 metres after travelling 40 in the air..
create an actual ruck. nearby defenders come in and assist with the tackle and it takes awhile to get up. but this has to be contrasted with quicker play the balls. in RLL2, there was no ruck yet it took forever sometimes to play the ball. wtf?
more penalties. the whistle was non existent in RLL2. by creating a ruck you create opportunities for more penalties. Offside was easy to avoid and high tackles rarely happened in RLL2. by copping bullshit penalties in the ruck it would actually make the game more realistic. going a full game without a penalty is just geniused. you have to feel like your against it every now and again.
All these things would lead to a better game.