It wasn't the best. I had fun with it, but Sm4sh is just so much better in every way, looking at it objectively I really think it's the best Smash game right now. I have a soft spot for the the original (has to be played with original N64 controllers though), but it does feel a lot more primitive.
But Brawl had a lot of content in it. I had fun with Subspace Emissary, especially when playing in coop, and I wish that Sm4sh would have had something similar. You could spend hours upon hours just on beating that mode alone, and then you have all of the classic game modes on top of that, it really made you feel like you were getting your money's worth (Though I never actually bought it
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Modern TVs have a lot more input lag than old CRTs, it can be alleviated somewhat with the "Game Mode" or "PC mode" that most modern TVs have that disable some of the post processing. Input lag without enabling that can be awful to the degree that even when just trying to do basic tasks on a connected PC, the mouse will be so laggy that it's almost unusable (Example: Dad's TV, I was trying to install emulators on it and I thought the wireless mouse was just getting a lot of interference because it took like half a second to respond but then every game I tried to run was unplayable because it took literally around half a second after pressing a button before it responded, the solution was to enable the PC mode that was buried in one of the menus, problem solved)
Monitors generally have less input lag than TVs.
But even when all is said and done, the input lag will never be 0 because digital signals don't work that way. Even in optimal conditions, with the best monitor/TV with the least input lag possible, it will not be as good as a CRT, and that's probably enough to throw off competitive Melee players, or even hardcore fans of retro games.
Indeed, and that's pretty much what I was trying to say in my previous post, and also signal lag between the console and the TV screen is not the only issue, there will be differences in how long the signal from the controller takes to get processed and how long the console takes to output the video signal, plus maybe some timing differences in the emulation itself. There are a lot of factors that could affect the gameplay when it comes to moves that require frame-perfect timing, there's really not a lot of room for error. Even if you had cycle-accurate emulation (not happening on the Switch or any current hardware, not for GC emulation), there will still be minute differences caused by other things. It's just impossible to get it 100% like the original unless the hardware is identical.
Low lag, but not 0 lag, and that's the problem