The list pasted below proves that, what you say is not exactly true. if DPSU were so bad, they wouldn't be having 2.5 lakh crore of book order(past + future).
Missiles Agni Series of Missiles (Range up to 5000 km plus). Akash : Medium Range Surface to Air Missile (Range: 25 km) BrahMos Supersonic Cruise Missile (Range: 290 km). Dhanush : Naval Version of Prithvi Surface to Surface Missile (Range: 250 km). Prithvi : Surface-to-Surface Missile (SSM) (Range: 150 km – 350 km).
Armaments 105mm FSAPDS ammunitionVijayanta and T-55 (UG) MBTs 105mm Indian Field Gun (IFG) & family of ammunition 105mm Light Field Gun (LFG) 120mm FSAPDS MK-I ammunition for Arjun Tank 120mm HESH ammunition for Arjun Tank 120mm Main Armament System - MBT Arjun 122mm Grad Rocket for BM-21 MBRL 125mm FSAPDS MK-I ammunition for T-72/T-90 Tanks 125mm FSAPDS MK-I KE Ammunition for T-72 MBT 125mm FSAPDS MK-II Ammunition for T-72 Tank 30mm AGS-17 HE Grenade ‘Rudra’ 450 kg / 250 kg HSLD Bomb with RTU and BTU 5.56mm INSAS Family : Rifle, LMG & Ammunition 51mm Infantry Platoon Mortar & Family of Ammunition 7.62mm Self Loading (Ishapore) Rifle Bund Blasting Device. Family of Mechanical, Electronic & Proximity Fuzes Family of Smoke Ammunition for Mortars and Guns Fire Detection and Suppression System. Fuze FBRN 2I, FBT 3I & 4I for A/C Bombs Illuminating Ammunition for 51, 81 & 120mm Mortar & IFG Influence Mine, Adrushy. Influence Munition Mk-II Limpet Munition Medium and Short Range ECCM Rockets Multi Barrel Rocket Launcher (MBRL), Pinaka (Range: 10 km – 38 km). Multi-Mode Hand Grenade. PF, Incendiary and Submunition Warheads for ‘Prithvi’ Portable Handled & Backpack Water Mist System Short Range ASW Rocket Under Barrel Grenade Launcher (UBGL). Warheads for Surface to Air Akash Missile
Combat Vehicles & Engineering Systems Aircraft Mounted Accessory Gear Box for LCA Tejas ArmouredAmbhibious Dozer. Armoured Ambulance Tracked (on BMP). Armoured Engineer Recce Vehicle (AERV). Battery Command Post Bridge Layer Tank T-72. Bullet Proof Light Vehicle Carrier Command Post Tracked (CCPT) on BMP. Carrier Mortar Tracked. Combat Improved Ajeya (CIA) Tank. Gunnery Task Training Simulator Launcher Light Armoured Troops Carrier Main Battle Tank (MBT) Arjun Mk-I. Mobile Decontamination System. Multispan Mobile Bridging System, Sarvatra. NBC Recce Vehicle. Operation Theatre on Wheels. Replenishment Vehicle Riot Control Vehicle Unmanned Ground Vehicle. Water Cannon.
Aeronautical Systems Airborne Early Warning & Control (AEW&C) System. Aircraft Arrester Barriers. Electronic Warfare Suite for Fighter Aircraft for Mig 27 &Tejas Aircraft. Heavy Drop System. Light Combat Aircraft (LCA), Tejas. Medium Sized Aerostat 2000 m3 “Akashdeep”. Parachutes of various Sizes and Capacities Pilotless Target Aircraft (PTA), Lakshya-I. Remotely Operated Vehicle (ROV), Daksh. Remotely Piloted Vehicle (RPV), Nishant. Technology for Identification of Friends or Foe Unmanned Aerial Vehicle (UAV) Rustom-I.
Electronics& Communication Systems 2D-Low Level Light Weight Radar (LLLWR), Bharani. 3D-Central Acquisition Radar, Revathi. 3D-Low Level Light Weight Radar (LLLWR), Ashlesha. 3D-Medium Range Surveillance Radar, Rohini. 3D-Tactical Control Radar (TCR). Artillery Combat Command & Control System (ACCCS). Battle Field Surveillance Radar-Short Range (BFSR-SR). Combat Net Radio. Command Information Decision Support System (CIDSS), Samvahak. Electronic Warfare System, Samyukta for Army. Electronic Warfare System, Sangraha for Navy. Electronic Warfare System, Varuna for Navy. Inertial Navigation System Interception, Monitoring, Direction Finding & Analysis System, Divya Drishti. Multifunction Phased Array Radar, Rajendra. Night Vision Devices. Pulse Compressor Radar, Indra. SATCOM Terminals. Secured Telephone. Servo Valves Supervision 2000 Radar. Weapon Locating Radar (WLR).
Naval Systems Active cum Passive Towed Array Sonar, Nagan. Advanced Panoramic Sonar Hull Mounted (APSOH). Airborne Dunking Sonar, Mihir. Ground Mines Hull Mounted Sonar HUMSA. Hull Mounted Variable Depth (HUMVAD) Sonar. Integrated Submarine Sonar System-USHUS. Integrated Submarine Sonar-Panchendriya. Low Frequency Dunking Sonar (LFDS). Moored Mines. New Generation Hull Mounted Sonar HUMSA-NG. Torpedo Advanced Light (TAL). Torpedo Decoy System. Underwater Telephone. Materials,
NBC & Life Sciences Systems Armour and Special Steels. Bio-digester Toilets Combat Free Fall Equipment. Flame Retardant. Heavy Alloys. High Altitude Pulmonary Odema (HAPO) Chamber. Integrated Shelters. NBC Detection and Protection Items. Permafrost Facility Submarine Escape Suit. Textiles and General Stores. Various types of Food Products. Water Purification System.
Microelectronic Devices and Computational Systems Artificial Intelligence Technologies Cyber Security Products Data Encryption Technologies Microwave Power Modules Technologies for Network Management System Technologies for Secured Communication