The "Quickmatch" Abby - General of Most Team Comps

The Idea is to allow abby to help secure heavy DPS early game, when most heroes are weak, to secure the XP Lead, while keeping allies alive. As you hit level 7, your Teamfight Support and Siege ability will skyrocket using Networked Carapace to heal everyone on team, and keep your minion waves alive much longer during sieges.  Level 10 Ult can depend, generally though clone an ally DPS hero or Tank is a better choice then the monstrosity. Level 13 to 20, you should be really being quite agressive with your sieging at this point, as most teams will be grouping up far more, allowing you to toss out locust into lanes they are not in and as long as you keep a eye on the mini map, can push hard late game. Level 20 hits, and you can duel lane push, or single lane hard push with a ton of locust.

Other tips, if your team comp has a team comp that isnt exactly strong getting merc camps, you can burrow in with teammates and toss some locust into the camp as well as hat your allies to help get those camps just that little bit faster. Use proper judgement though when trying to get camps in enemy territory that way.

Abby is a strong hero if you allow yourself to be agressive and can multi task to keep out of harms way, but is vulnerable to "ally" feeding. As without teammates doing what they need to be properly doing, you will not be able to make as much of an impact.