I live in Toronto so I've been to many indoor fields. The 3 largest contenders in being the best indoor paintball field is Area51 (the best), Paintball City (ok), and Sgt.Splatters (the worst)
My biggest beef with Sgt.Splatters is the very low light conditions. It's almost impossible to see through the darkness. There's very little room in where you can set-up your equipment and each time you go to thier field, you must watch the "instructional video". The front desk is run by teen-agers who are somewhat lazy but can sometimes be helpful.
The field itself is very large which is a plus but again, nobody can see anything due to the low lighting conditions. The walls are covered with sludge and the ground is made up of sand. The sand gets all over you and go inside the internals of your precious marker.
Area51 is amazing, Paintball City is ok, and Sgt.Splatters will never see my business again.