I'll try to clarify:

In Patlabor, the Spider Tanks that we see are either non-operational prototype models or seen in the second movie, a command vehicle. The two bipedal machines called the Helldiver and Hannibal form most of the Japanese Ground Self-Defense Forces' labor fleet.

...It's wrong. It's more of tanks are more dangerous than a robot...

Not true in the most "realistic" works the mechs are justified in the story as being a combination of heavy infantry/calvary, not a replacement for the MBT. See:Heavy Gear(at least the first PC game and table top)Or even in Mech Warrior were the best tanks rank are as effective as the best mechs. In the same way a tank does not make jeeps or AP Cs obsolete, the mechs are justified as fulling a different battlefield role, even if it'll never happen in real life.

We don't care about "most realistic works", we're descript "real robot genre" here. And even you said "the best tanks rank are as effective as the best mechs", not better.

Very well for the trope page. But in Heavy Gear tanks are far superior to the robots and in the Mech Warrior table tops good tanks are usually more of a pain to deal with than good mechs due to their superior range. Both of these are Canadian/US games, the inherent superiority of the robots seems to only be present in Japanese productions. It's more gaming thing in this case than a cartoon thing anyway.

By Gaming, you might mean tabletop gaming (which I have very limit experience), but definitely not video game.

I would highly recommend both heavy gear PC games, although the first has ridiculously complex controls. The second has more simplified fps like controls. The fist one definitely believed in Tank Goodness, play a rear area raid from the southern side and prepare to be raped by a tank the instant you get out of cover. If you like using lots of guided weapons and skulking about in the hills rather than charging in head first then that game for you. Although second PC game has hover tanks(light tanks?) than are pretty much cannon fodder and no awesome railgun armed tanks, and gears in space which doesn't make a lick of sense. Basically if you like the more "traditional" mecha for the sake of mecha scenario then the second PC game will be more to your liking.

(SIGH) It does not important how certain game or two potray Real Robot, the majority - many based on Real Robot anime like Gundam and Armored Trooper Votoms - still potray mech as superior weapon (but may not overwhelming better).

In other words, you can boast it in Heavy Gear entry on example list. But they aren't a general rule as you claim.

Oh. And when I play mech game, I prefer something like Another Centurys Episode and Armored Core more.