I would argue that aside from Generation 7, each generation has lasted 5-6 years before a successor is released. 

@OP. This generation won't be remembered as the worst, but it definitely won't be remembered as the best. It has good things going for it, but it certainly has issues plaguing it. Most of the games with a lot of hype surrounding them have been lacklustre, funnily enough they seem to mostly be Ubisoft games in this regard i.e. Watch_Dogs, The Division, Assassin's Creed: Unity etc. 
EA has been just as shitty as they were during Generation 7. Their handling of Star Wars Battlefront has been atrocious. I really wish another developer/publisher could handle Star Wars titles. It sucks that EA has the sole rights to develop Star Wars games.

Despite PS4's lead, it has been disappointing in regards to high profile exclusives. We know that Final Fantasy VII remake is exclusive, however, this has been confirmed to be a limited time exclusive deal, just like Rise of the Tomb Raider is for Microsoft platforms.
Many of the high profile games that will show this generation's leap over Generation 7 are yet to be released (outside of Nintendo). Titles like Uncharted 4, Horizon, and Final Fantasy XV have yet to release. 

...and then you have Nintendo's lacklustre sales with the Wii U and Sony's with the PS Vita. Both fully capable platforms with a solid lineup. However, they both did not succeed with the mainstream audience. 

This generation has not been the worst; in the grand scheme of things it certainly won't be the best either.

If youre a supporter of the Wii U and Vita you may think that since they both underperformed. But if you follow the PS4/3DS or even X1 and PC I think you'd find this to be a great gen. I like it, anyway

I like this gen a lot. WiiU/3DS/PC gives me everything I could possibly want. Still, I haven't got enough money to buy everything I want. I haven't really touched my PC this year, it's enough for me with the two Nintendo platforms (that's why I'm hyped as hell with the NX). And, yeah, the rise of indie games is good news. Some of my favourite games of this gen are indie, Undertale being a really standout.

As I only follow Nintendo I can only comment on them.

Handheld-wise, this has been the best generation by far. The 3DS is an incredible console, a massive range of classics with BC allowing it access to the hundreds already available on the DS. eShop and VC have also been much better on 3DS. I've put in thousands of hours on the console and that's when I was sure I'd eventually tire of gaming.

Home Console-wise, yes this has absolutely been the worst gen. There have been good games, but the Wii U doesn't have anywhere near as much as even the Gamecube did. Sold my U a while ago to buy more 3DS games, haven't regretted it once.

2013 3DS must be the best year I've ever experienced in one gaming device ever. It was just insane the ammount of quality titles that were released that year.

This again. 8th gen would have to work hard to surpass the underwhelming first couple gens. Every gen has had its issues.

Entire gen won't be remembered except for the PS4

I'm already forgetting the other consoles

Far from it, the earlier generations are arguably worse ...

The last generation has been remembered a little too fondly. For every good thing that happened there were always bad moments to spoil it. The 7th gen is both a step forward and a step backward ...

Considering the amount of poor game launches and the focus of pity console specs this gen has out done every other gen. I can safety say its not the best gen in my book, unless your a PC gamer.

Gen 8 is already better then Gen 7 so it cannot be the worst.