Minons are cheep to replace after a couple mana items, (monitors with a completed cooldown will do, though oak and LE have better alternitives). Minions dieing just means full health replacement can be sommoned to explode more mines, minions are easy to replace (i think too easy). you assume that the enermy demigod will be forced to cast something while in range to break the mark.
For example general spends 350 gold buys and summons monitors, moves into sight range with reg
- send monitors as sucide minecleares in a line towards reg (monitors either die to mines or show that no mines have been layed)
- reg moves forward and casts MotB
- general send minons to attack (he stays next to the tower) and recasts monitor breaking MotB (while outside reg range, minions deal significant damage to reg (his health is poor),
- enermy demigod targets with interupt equlivent abiltiy reg is dangerous levels of health and has to reteate before enermy demigod gets in mele range.
- if reg tryes to mine the minions they can be replaced from idols or minion/creep deaths.
If done correctly (this may have been poorly explained) and no one has has fed reg, reg will find he has no counter and reg will retreate or die. Reg is far to squishy to deal decent dps and keep safe in larger than 1vs1, though slows are nice).
Now, how can reg be ok vs assassins, but useless vs generals? If he is, doesn't that mean that most assassins, [], are too weak and shouldn't be used?
No the peaking order is not one dimentional (even though reg is at the bottom), as i said reg has special needs [if you want to beet him easily and safely every time] these can be meet by only generals.
The resaon reg is good vs assassins is assassins have no way of pre detonating mines and need to get into range of reg to force him back. Geneals can do most of this job with minions negating the risk and debuffs.
A single mine though does not change the fact that reg lack a decent interupt class ablity when reletive to the good demigods he has much less dps. (Bite which costs less (i think) and has a lower cooldown will almost cancel mine damage)
Unless you are massily fed have you as reg every been able to challenge 10 buffed spirts (this is not including the oak that summoned them)? (replays would be good evidance of this, i can get some that indicate he cant if you need to see them)