As Trumpnut mentioned earlier in their post, there are no really "bad" suburbs of Upper Hutt per se. Upper Hutt has a lot of middle class suburbs (Totara Park being one of them) with some nice pockets and some not so nice pockets within most of them. Totara Park is a pretty solid and reliable suburb of Upper Hutt with nice, well maintained properties and nice, quiet tree lined streets. One of the better overall areas in Upper Hutt, although there are the occasional burglaries in the area unfortunately. The primary school is decent without being exceptional, pretty small school (around 300 pupils).
Most streets are quiet in Totara Park and around the same level housing wise (Malcolm Gillies Grove and Galveston Grove are a lot nicer, being the exceptions). Hartford Crescent and possibly Larchmont Grove/Indiana Grove area are probably the worst streets (although they are still decent, much better than most streets in other areas of UH) but there are no terrible streets in Totara Park.
Heretaunga, Silverstream, Pinehaven, Riverstone Terraces, Kingsley Heights, Emerald Hill, Mount Marua, Mangaroa/Whitemans Valley and Kaitoke are all nicer, safer areas than Totara Park (however more expensive to buy/rent property on average as well).Totara Park is a solid UH suburb, decent for all types of people who work in Upper Hutt and one of the better suburbs in UH for commuting to Lower Hutt, Porirua and Wellington for work as well. Hope this helps