Abathur seems like a very difficult hero to play effectively.
- Should I be moving around between lanes a lot?
- Some players stay by the core, and others move all around the field.
- How do I decide who I should be helping?
Abathur seems like a very difficult hero to play effectively.
Allmost all Abathur actions are related to map awareness. So keep an eye out where your "services" are needed. You mostly need to focus on the following:
If you are very comfortable with your play, Abathur also makes for a great bait. However, make sure your allied heroes are ready to jump on the enemy hero that's trying to kill you.
Basically, you need to keep an open mind over the map. Find where the action is, and assist that spot. You definitely need to keep moving where you are helping out. You need to assist any skirmishes that break out over the field. If there are no skirmishes, then help someone take a merc camp or objective. Very rarely will you keep your focus at one spot. If nothing is happening around the map, then assist whoever might be taking an objective or pushing a base. As soon as there is action elsewhere, move your focus there.
TL;DR; Try to help the most intense spots at the time. If there is action at multiple places, you can choose to help out the place that is out numbered, or help the side that is outnumbered win there fight very quickly and then move to the outnumbered fight.