Even though I guess I contributed to the negative comments above, personally, I wouldn't worry about it. SL has a great location and is super convenient to everything. It tends to get a bit less favorable comments because, at least among the MK resort CLs, it's the one lounge that isn't really an 'exciting' space in itself. But the food/beverage offerings are nearly identical to RPC... and it's usually much cheaper than other CL options, which doesn't hurt!
As to IPO... the IPOs don't exist in the form they once did. It was replaced by Disney Signature Services (DSS), which is a centralized CL planning service. Effectively the same as the IPOs, just centralized and not at the resorts. Here is contact info if needed:
(407) 939-7777
disney.signature.services@disneyworld.com
Personally, I pretty much only use DSS for adding room requests to my reservation or for making more obscure reservations such as pool or water park cabana rentals, etc - things I can't otherwise do online. Everything else (ADRs, FPs) are plenty easy to do online so I don't typically use them for those types of requests.
Hope you have a great trip!
Similar to what I said above, I wouldn't over-think it. Online reviews and comments tend to only focus on the few nits and don't highlight the overall strengths. SL has pros and cons, just like all the resorts and CLs. Have fun!