I love Blogger. Really, I do. But I find that I bump up against its limitations quite often. The first one I ran across when I turned on Google+ integration. Actually, that one kinda pissed me off. It's not so bad that it linked everything to my real name, because a little CSS and a custom About page easily fixed that. But it totally linked my Blogger account to my Google+ account, which means that I comment on other blogger-driver blogs under my real name, now, or have to use another log-in method to comment. Very frustrating.
Another limitation that I'm starting to see more of is with widgets. When I powered the blog with Blogger before, it was via ftp to my webhost. This allowed me to use custom PHP in my widgets, and I took advantage of that. I might be able to create a sub-domain on a host and create php-powered widgets that way, but it's still not ideal.
Finally, the commenting system, again. I hate that it displays the default Blogger page when commenting, instead of having it themed like the rest of the blog.
So, I'm second-guessing going back to Blogger. Maybe I'll move back to self-hosted Wordpress yet again. If so, I'll try WP-United again and see if I can get that going. That was the most powerful overall platform I think I've used. I had chat, phpBB, Wordpress, and a wiki all using a single sign-on. It was glorious. If I can get that working again, I'm definitely going back.
edit: I found an option to allow embedding comments, which I think may fix the one issue. But the settings on when a comment needs moderated is way too restrictive as well. If I approve someone's comments, I should have the ability to allow that person to bypass the moderation system.