Some very arbitrary ratings ahoy...
Lossl (5/10? 6/10?) - not overly keen on it, especially given Swedish reports he's on ~£50k p/w. It feels like we could get cheaper back up elsewhere, but maybe that's a risk not worth taking?
Sidibe (7/10) - fine as a loan, would have been more annoyed if it was permanent.
Delph (6/10) - fine. Points knocked off for him being injury prone and because wages are maybe high for an ageing back up.
Gbamin (7/10) - look, I've never seen him play. How can I rate him fairly? He gets points for being young, versatile and seemingly decent defensively. He could be good, but wasn't overly impressed by him on the ball on the Youtubes.
Gomes (6/10? 7/10?) - it's not really a secret that I don't rate him as highly as others. I feel like we've missed an opportunity to massively upgrade our midfield this summer with the moves for him/Gbamin, but he's a very decent player.
Iwobi (8/10? 9/10?) - I really like him and he meets very specific needs (chance creation, getting the ball up the pitch). Points knocked off for not being a great goal threat.
The centre back thing isn't ideal, but we've got two decent £30m centre backs already. In general I'd much rather we kept our powder dry and waited for our top targets, rather than buying players who aren't good enough. It's easy for me to say that though as I've never seen us as challengers for top 4/6 this year. As @GLewis
said, I don't think our options are much worse than Leicester/Wolves, for example. Defence is also the one area of the pitch where you can make up for shortcomings with tactical tweaks.
Probably a 7/10 window rising to an 8/10 if everyone smashes it then, eh? Another summer or two like this and I think breaking the top 6 could really be a possibility.