Fire Peashooter is a fairly basic plant as far as 2-sun fighters go, due to its relatively decent stats and lack of innate ability. However, it does have a good strength stat for a 2-sun cost plant. In addition, its tribe means that Fire Peashooter can benefit from Template:PvZHLink, as it can gain both offensive and defensive benefits by standing behind the plant in question. It can also benefit from The Podfather, as it gets +2/+2 when the latter is on the field. Otherwise, Fire Peashooter should be treated as a Zapricot with less strength, as opposed to more durable plants such as Pismashio.
Against
As Fire Peashooter has a relatively low amount of health, anything that could do at least 2 damage should be able to take it down with little cost. A Fire Peashooter + Torchwood combo, however, is a different story, and you should consider either using Deadly zombies, instant-kill tricks like B-flat or Locust Swarm, damaging tricks such as Bungee Plumber or The Chickening, or cards with plant-moving abilities such as Sumo Wrestler or Terrify to deal with it. If Fire Peashooter is boosted in any way, consider using Rocket Science. Beam Me Up is also a good counter to this plant, since both cancel each other out.