Well,
I must say I never found any cheating. That's odd because it seems a lot of people complains about it.
But for what it's worth, I host my all games, always. I was not doing that before but after a lot of disconnected hosts, bad connections and so, I decided to always host myself.
I play as Asari Adept, reset the habilities (I don't need stasis) and go warp and throw. I see a lot of projectile-gun but never cheaters and as my formule is quite efficient, I am almost always first except when techs uses their powers and cancel or detonate the biotics or when there is an other biotic.
I must say I don't understand the point of cheating IG : experience is nothing and money is everything (that's why I am N7 round 500 but play since allmost the beggining). You may be first of the chart but you will still need money to buy upgrades and weapons which are everything. (without them you can't do a lot)
If you cheat with infinite missile you only have experience.
Money cheating is an other thing and honestly I don't care (it would not be the same in PvP...)00. I have fun in the game and I know that when I have my suitable level X weapon and level V mod and upgrades, I don't need anything more. More money is to test and play with a lot of characters and if you need that, be my guest and do it. I am a monomaniac and I love it.
Of course, EA does not need "free credits" as their marketting is axed on the fact we will buy bioware point to buy more packs, so it's greed talking here, not justice nor "it"s anoying for the players".
As a player the only thing that's anoying me is players playing for xp only and going forward solo in gold and waiting for someone to reanimate them when they fall because they are alone... at the other side of the map. Or someone killing all the ennemies I warp so I can't detonate them, and after that, I must still going to reanimate him when he is taken hand by hand with a geth hunter.
I am often first of the chart but often fourth too, because when someone else has warp, reave or stasis, I give a rain of throws so he collect the xp and not me, and he is first on the chart (yes, biotics detonations are not "just", the xp is given almost entirely to one of the two players...) and me I am fourth.
I am fourth but I had fun coordonate my biotics with someone else (no, that's not what you think

) and see a team effort at work and those are often my best parties.
But, of course, this is not encouraged by EA nor the "I go solo while three slaves get my back and I collect xp" is discouraged either. Though most of those cessions are the most boring games I have played.
Justice has nothing to do with multiplayer. Rules are rules only, and you chose to respect them or not at your own risks and concidering your own feelings.