You must be 11 if you think that Dr. Doom could defeat Iron Man. Here's a list of what Tony Stark has invented:
Louisville-Slugger-sized grenade cannons
Jet-powered roller skates (enable an entire infantry to move down the highway at 60 mph)
Atomic Naval cannons (fire a nuclear salvo 500 miles, revolutionizing battleship power)
Flesh healing serum (closes open wound in two seconds with synthetic liquid tissue)
Alloy for the shell of the Stark International's space capsule (resists penetration of space radiation)
Burp-Gun (fires cartridges the size of .50 caliber machinegun bullets, the equivalent of artillery shells, at a rate of 1,000/minute)
Pocket-sized disintegrator ray (installed in a common flashlight case)
The Y-69 three-man rocket
Anti-gravity device (only working model; a ray of an unsafe design, but so powerful it can literally move mountains)
Remote-controlled observer missiles (take pictures of the enemy from the missile)
Uranus-11 rocket
Proton anti-armor gun
Moon Missile (which was actually a rocket with the first capsule that could fly independently of the main rocket)
Mangler missile (with a guidance system so sophisticated that it could actually attach itself to an enemy rocket, control it, and destroy it if need be)
One-man mini submarine (a scout sub; can out run and out flank almost any torpedo; compact size gives it great strength per cubic inch)
Sub-miniature reverser
Enervator ray (experimental medical device)
Centrifugal force ray
Anti-missile missile hand gun
Uranus-12 rocket
Life Model Decoy (of others or himself)
Electric Memory Bank (a repository where Stark has recorded all of his activities and ideas so humanity can continue to benefit from his vast knowledge after his death. It contains Stark's lifelong knowledge)
Light-bending device (installed in Iron Man's S.K.I.N. armor, makes the suit invisible to those looking in)
Magnetic memory device (channels tractor-pressor beams to reassemble things)
Security-Scan (the forerunner of retinal and/or biometric scan)
Pre-programmed micro-manipulators (assist his workers in building the complex micro-circuit sub-assemblies)
KX-59 Mark II missile destruct system (an anti-missile cannon)
Aero-tank (a hovercraft/tank hybrid)
Weather satellite
Space Shuttle Star Reach I (years before NASA)
Quantum IX (manned orbiting laboratory; precursor to NASA's Skylab)
Starjump shuttle (Stark International's second space shuttle)
Micropower cell (a commercial version of Iron Man's internal energy storage cells)
Anit-ballistic missiles
Heat-seeking anti-aircraft missiles
Napalm gel fragmentation grenades (shoulder-fired from a companion launcher)
Laser-guided 50 lb shell canon (guided by a command satellite it could home in on the body heat of the enemy)
Cosmitronic cannon (takes cosmic rays found in the atmosphere and harnesses them for a variety of uses)
Computerized fire-fighting system (installed at Stark International's Long Island Sound plant)
Para-gravity deflector (aka Rescue-jet, a one man space escape device)
Stark Satellite One (another Stark International space satellite)
Atomic piledriver (a hammering machine capable of pounding through mountains)
Numerous top secret intelligence systems for the U.S. Government
High level communications gear and automated security devices for the U.S. Government
Multiple patents for aeronautic instruments and controls
The Avengers' Quinjets
Developed an electro-therapy technique to helped crippled people
Memory extractor
Voice-activated elevator
The Avengers' Land Cruiser (a hovercraft-like vehicle)
Jupiter Landing Vehicle
Jet carts (for transport on Stark International's Long Island Sound campus)
Electrosthetic conductor (an alternative to conventional anesthetics it uses sound waves to calm the body's electronic impulses)
Sonic borer (a low-heat new drilling method for deep sea drilling rigs)
Energizer link (the revolutionary main component of the sonic borer)
Assorted commercial security systems (including proximity alarms)
V-TOL craft (with integrated radar-bending stealth system)
Gauntlet mounted photon shields/blasters (designed for SHIELD agents)
SHIELD's helicarrier (massive one-mile long flying base)
Atomic piledriver (a hammering machine capable of pounding through mountains)
Took part in developing Captain America's shield
Several of Hawkeye's trick arrows
Hawkeye's hearing aid
Rocket Ram
Nick Fury's flying car
Nick Fury's pistol
Thermal-shocker Class-A missile interceptor (a tank-like weapon, at the time the biggest gun made, just short of an A-bomb class missile)
That doesn't include the thousands of parts needed to run his armor. Stark may not rule a small, poor, failing country like Latveria but he does own Stark Industries which is a multi-billion dollar industry (probably more than the total income of Latveria) and has over 20 factories located world-wide. Stark also hasn't been drunk for more than 100 issues.
Stark is impressive...