For main pvp team, hiruzen almost always is paired with danzo to get to cast his reaper death seal twice, ergo killing 2 opponents. Without danzo, you basically trade 1 for 1, which is debatable if worth it. On his own, he's got hard hitting team wide mystery, provides a great meatshield with Enma and buffs team's resistance, but lack of chases, cc, debuffs and weak buff (compared to hashirama/tobirama) makes him less appealing. If you dont have meta teams, use him. Fairly cheap team could consist of any main, iruka, hiruzen and 4th konoha ninja that fulfills missing role in your team (either support, healer or dmg depending on main). If you can get some chakra generator ninja to allow him to cast mystery round2, thats great.