No, Regulus is far better. The basic range of snipe is far greater and Regulus also has a tracking device to boost.

In every game exists a "cast range" AND a "max target range" (for when, during the casting, the target moves away from the cast range). I think, for the max target rangevalue, 2x of the cast-range would be fine.... having it infinite, like now, is kinda lame (also you miss the fact that fireball have higher dmg than snipe, you cant compare them. Oh, and you miss also all the cheesy spells of TB too).

In guildwars once you started casting a spell it always finished get casted (there are some with a projectile which can be evaded though); so its not in every game. In Warcraft III chain lightning also follows you when you portal sometimes.

yes this is a close range spell and it shouldnt happen. have anyone tested it with humans since when ai uses hammer slam if u go away u take full dmg again.

alsa i believe regulus is better many more benefits. If fireball couldnt follow it would prove useless even with bigger range u could avoid it and that will make ice 100% better than fire. Since ice isnt useless rain of ice+frost nova+deepfreeze+3xshatter=3k dmg!

that doesnt happen against ai even if u go away, i havent tested with humans though

So when you say you wont get the full damage your saying that if someone warps away from the hammer slam before it hits the ground no matter where you are you should take damage but not the full damage?  I have only tested it out once and to me it appeard that I was taking near full damage.  I couldnt tell exactly how much because the hammer slam actually killed me.  Maybe if they are going to have it deal damage it should be based on how far away you make it once the hammer actually touches the ground.  From what i could tell I was nearly under rook when he started the animation and by the time the hammer hit the ground I was full warp stone distance away and still died.  The distance of the warpstone is pretty decent too (farther than most character ranges minus regulus). 

Being able to dodge a spell should be skillful and rewarding not discouraging if stuff like this stays the way it is.

Well then snipe should work just like that, with a maximum range...but wait...the further you run from snipe the more damage you get. So these are the alternatives:

1: Torchbearer's fireball has a maximum range, but then it would need a normal range or damage increase (the damage is already quite good). And Regulus' snipe doesn't have a maximum range...then you could bring up your argument that it isn't fair.
2: Both of them get a maximum range, but then fireball and snipe would be too similar.

I say keep it as it is, when you port with low health you most certainly port to your crystal which regens your HP before fireball hits. Warpstone is another thing, it shouldn't be a must item for all demigods, but right now, it is.