Dreamcast was. It's Japan launch lineup in 1998 was not ready so it was pretty bare. Should have waited for a year for a worldwide launch. As much as I love DC. If I could retroactively change some things. I'd add DVD playback. A second analog stick and 24MB of the main ram on top of the 8MB of Vram. It was a well-designed console but just needed a little more oomph.
Saturn and 360 are the biggest offenders. Saturn was a great console of the Japanese library but man was it complex and a mess. Powerful but difficult to work with. I don't have articles from 2005 on a defunct website handy but as I recall DS was originally meant to be a dual-screen GBA. I can't confirm this tho. The rumblings of PSP's power in 2003 I believe left Nintendo to change the hardware to be a 3D machine fairly late. I think this is why a lot of 3rd party games early on did not look like anything better than a slightly enhanced GBA game.
Dreamcast also wasn't helped by Bernie Stolar's outright disdain for the Saturn. He said at E3 1997 that "The Saturn is not our future." He actually wasn't wrong, but lot of third party developers and Saturn consumers were really pissed off about what Stolar said. It did poison the well a bit for the Dreamcast, especially in light of how the Saturn had followed the Sega CD and 32X, two other platforms that Sega dumped pretty quickly with little support. At that point Sega had painted a pretty clear picture of itself as a company that couldn't guarantee a long-term install base. If Sega couldn't be bothered to support their own platform, why should anybody else support it?
Nintendo was sweating bullets about the PSP. It was a pretty impressive little gadget, and people thought it was going to repeat the PS2's success in the handheld front, which would have led to complete ruin for Nintendo. It even had Grand Theft Auto on it. I got a DS in its launch year, but didn't know what to make of it. The DS turned out to be a really good handheld in the end.
Sega should of waited for Broadband, dial up was super expensive back in the day.
Sega didn't have enough money to survive enough to see broadband become a standard without a home console. They might as well not have bothered with the Dreamcast and just done Virtua Fighter and Sonic Adventure as PS2 launch titles in that scenario. They'd also have been going head to head against the Xbox by that point.