There is nothing wrong with the typhoon, for mid to long range engagements, use cover to boost your accuracy. Ive used it in Platinum/Gold matches(Weapon has been anywhere from III toVII) on the following classes.
Batarian Soldier, Turian Soldier, N7 Demolisher, Turian Havok, Turian Ghost, Volus Engineer(It was mostly for comedic effect but it actually wasnt bad as soon as stuff gets close so pattern didnt matter.)
As most people have said, ditch the HVB and go with the Extended Barrel, Using either AP III/IV or Drill Rounds III to give armor reduction and penetration. I highly reccomend a Stability module consumable/gear if you are planning to be more mobile.
For Gold/Platinum vs. Bosses, its always nice to have a power that compliments the typhoon if its your primary build. For example, the Volus Engineer with a recon mine debuff and prox mine debuff on target was shredding Atlas and Banshees, even before other team members got on target. Same holds true for the Turian Soldier mine, Havok Cryo blast debuf, Ghost Overload specced high shield damage to get those AP rounds in to the more vulnerable armor quicker.
In my opinion and we know everyone on the internet has one. The biggest issues for people with the typhoon in general is not using the cover advantage when possible and the spool up time. Pressure units like dragoons/phantoms/bombers/hunters can sometimes be issues in close proximity. Just get used to them, assume if there isnt one in visual range, its right behind you.
Anyhow, thats my 2 virtual cents...
Russ