Don't know where to post this, so I would just put this where it's most relevant.

1) How do DoT ticks work? I know its 1 tick every 3 secs and each tick delivers the potency amount of damage but overall, how much say... a DoT that lasts 15 seconds with a potency of 30?

2) Is overlapping really that bad? I can't really snag the point in which a DoT finishes and a new one should be applied, so I will always apply it before the last tick, or the last 3 secs of the DoT, so it will continue on.

3) Can DoT's crit?

4) If a buff is applied before the DoT is applied but the buff vanishes before the DoT finishes, does the rest of the DoT's tick get affected?

5) While we are on the topic of DoT, how much does poison potions affect gameplay? Is it good?