I loved Skyward Sword - I blasted through it the week it came out and rank it amongst my favourite games in the series.
I started up Lost in Shadow (or rather A Shadow's Tale as it's called in Europe) last year too. I got a good chunk into the game but also found myself struggling to motivate myself to play further and never finished. There's nothing really wrong with it, but it felt a bit repetitive to me.
I finished up Sonic Generations last week. It's interesting to see where the franchise was at in 2011 when this came out for 20 years of Sonic - the game has levels based on the classic games (Green Hill from Sonic 1, Chemical Plant from 2 and Sky Sanctuary from Sonic 3 & Knuckles), followed by 3 from the Adventure era which I surprisingly had quite a lot of nostalgia for, but the change of setting really came through - much more urban environments represented with both Speed Highway and City Escape. Finally get to the (at the time) 'modern' era which really starts in the doldrums with Sonic 2006, and then gradually picks back up with Unleashed and Colours. It'd be interesting to see a newer take on this with the current 'modern' era featuring Sonic Lost World, Sonic Mania and Sonic Forces.
Speaking of Sonic Mania, thats a game that does this premise but better, in all honesty. Especially with the 2D stages, which have weird physics and which move altogether too fast at times in this - the spin dash in particular takes off like a rocket and I couldn't make out what was happening after using it most of the time. The 3D stages are superior in this game although I felt the first half of the game was better than the latter. The Sonic 2006 stage was especially bad (how appropriate), whilst the Colours stage was a bit tedious. The highlights were the recreation of Sonic Advernture 2's opening level in the 3D stages, and the excellent Rooftop Run from Unleashed.
Overall though, this is a good game and I had a great time with it. As an old-school European fan I'd have liked to see some representation from the 8 bit games and I'd even like to see stuff from the Advance or Rush games - but as is the game doesn't outstay it's welcome. I'd recommend it. It's a shame Sega decided to throw out the baby with the bathwater again after this and needlessly redesign the Sonic formula again - they were onto something that worked in this era.