Earth Defense Force 2025 has been the game of choice at the Maxwell house (do not ask about coffee we do not have any). I worked at Gamestop when the first game, EDF 2017, came out. We pulled the game out of the shipment box and all went "wtf is this?" No preorders, no reviews, we had not heard about it until that moment, so we did the only rational thing and popped one of the three copies into our store's XB360. It sold out within minutes. Everyone who worked there wanted it. Everyone who saw it and got to play it wanted it. We couldn't keep it in stock for weeks and called other stores for their copies. No other game we ever got during my time there was so unnaturally popular. So when the sequel came out (Insect Armageddon doesn't count, it was made by another company and is not HALF as good), we jumped on it.
2017 and 2025 are a play on all those old giant alien bug or Japanese kaiju movies. You fight enormous ants, spiders, walking robots, and spaceships as the little grunt ground troops. Except the little grunt ground troops get rocket, missile, and grenade launchers, assault and sniper rifles, and infinite ammo. You find and unlock literally hundreds of various weapons from a little homemade flamethrower to the Genocide Gun that destroys entire city blocks.
The voice acting is well done while keeping the silly/stupid corniness of those old movies ("I need ammo!" "...I forgot the ammo!"). Your AI teammates are completely competent and can hold their own while you collect dropped goodies. 2017 has local co-op, while 2025 has local and online. ALL the buildings and most of the scenery are 100% destructible. 2017 has one class and hundreds of weapons, while 2025 has 4 classes (ranger [normal weapons guy], wing diver [flying bombers], air raider [summons outside help, like mechs to pilot and bombing runs], and fencer [walking tank]) with hundreds of weapons for each class. 2017 had around 52 missions, 2025 allegedly has near 80, both with 5 levels of difficulty.
My fangirling is getting a bit long here, so I'll just say EDF is an amazing, under-appreciated series and you guys should try it.
tl:dr - Earth Defense Force 2025. It is good.