In my opinion reg is weak due to hight speed damage dealing and soaking dealing demigod builds (most sedna, ub, oak and LE builds) being over powered in the current game ballance. Reg is fundimentaly weak vs these kinds of builds (especially if his speed debuffs can be be removed (level 3 heal or sheild, these also remove MotB before it activates). Reg is currently strong vs slower/support demigods/builds wich are currently not compeditive in most games.

If all 8 demigods were ballanced so they all as equally playable as posible (not shure if this will ever happen), that is all demigod could compeditively full the role that was meant for them. I could see reg being strong vs Rook, Qot and UB (would have to be nerfed a bit) and still be good at taking out towers and creeps with AA. He would still loose badly to sedna (and oak) due the ability to remove reg's speed debuffs.

To the op the sedna vs reg matchup is in so many ways in favor of sedna that no amount of small changes could change the outcome.

I take it Sedna was lv20 (or up there) to be in your base w/o much difficulty. Support healing + massive HP regen, though at that point, she prolly only healed for the AoE dmg that comes with the highest lv heal, just to kill creeps (for fun).

Just goes to show that even a demigod that's often feared or called OP can be, actually, balanced out (oh my! there is a such thing as balance! Surprise!).

In the last game I played Sedna, I was only able to be killed when I was ganged up on, even at the start (Blood of the Fallen is a great favor item to start with).

All DGs are good against some, and weak against others. It all comes down to what they are good at. Personally, i play full snipe, motb and mines. This works for me. I can support other DGs very good and finish off fleeing enemies, but can also kite them with range upgrades.

Reg is squishy by nature and is not meant to go head on against a tanking DG like rook (or in this case, sedna). His purpose is to harass and weaken untill the big boys come in. I always had my ass handed to me if I stood and fought someone. I just retreat, and as soon as they stop pursuing, i just aa them or mine them etc.

Your mistake was that you were trying to take on a demigod that is not bothered to much by constant aa damage. Sedna's weakness is repeated heavy burst damage and debuffs. I don't see Reg effectively holding his own against sedna.

Not saying that Reg is weak, by any means. Love playing that guy, fits my play style perfectly. Any demigod can be considered "weak" if the person playing it does not know what he/she is doing. I'm not reffering to Sathynos here. I am just saying that there are situations in which you could really use a reg, and situations when you will constantly get hammered. It depends on play style, your team, the enemy team, the map etc.

Well, I'm not the same level as you, but I think I've played enough to say that you need to qualify that statement more. AA reg shines late-game, when 700 damage per shot and 3-4 shots per second overtakes the damage rate of any ability in the game, while costing very little mana in comparison. Factor in the criticals and you've got a very serious threat. A 5k crit just plain hurts, a lot, even at level 20. The threat of one of something you have to watch out for. Nevermind the fact that each shot has 20 to 32% lifesteal.

I've been far more effective myself in custom games once I switched to AA reg. The nice thing about the AA reg is you can switch to a mine reg early if things aren't working out. Plus you can level up very quickly early on, so 1-3 exp level advantages can be leveraged.

So in short, yes, AA reg can suck at certain times, but it is a build that is focused on late-game. By then, he can 1v1 many DG builds. Speeding, oozing UB is about the only DG that I've found is consistently too strong because he can get close enough to use ooze on you and hamstrings your dps. I try to never, ever 1v1 a UB if that's going on. Fortunately, in most games I play I end up being 1-3 level higher than the other team by lvl 12 and the game is over by the time I'm lvl 16 or 17.

Im just blown away by your well build up opinion and strong arguments 

I think he is, i dont see Reg as a front fighter. I see him as a chap that does:

Support burst with mines.

Can safely kill towers

Finishes people off at great range

Provides slows.

In my book, that is utility, also since reg isnt that reliant on hp/armor like some other DG. A good reg does not really not tons of hp/armor. Making him even more supportish since he can support that citadel, this is situational however.

PS full AA regs are evil, however i always hope they get atleast snipe one, since its so awsome in turning battles, helping ganks, klilling runners.