This is a common complaint, and one the purist in me is sympathetic to. These days, I have a more nuanced perspective on English.
Yes, English is huge and complex. However, the things we are trying to express are themselves huge and complex. A big language gives us many many colors to paint with. I mean different things when I say I am "sad", "down", "blue", "disconsolate", or "woebegone". There is a learning burden on English speakers to loading such a large language in their heads, of course. But, in return, we get a higher-bandwidth communication protocol.
The complaints about pronunciation are also common and valid in many cases. Things like the Great Vowel Shift lead to words that no longer sound like they are written for little useful reason. But in some cases, pronunication varies between similar-spelled words because their etymology is wildly different.
A word's spelling carries both pronunciation and meaning. When the pronunciation varies, it is often because the underlying morphemes are different even though they are spelled the same. This means the spelling doesn't teach you to pronounce it as well as you like, but once you can pronounce it, the pronunciation helps you know what it means.
And, as a lingua franca for the world, I think English is great. English is riddled with loanwords and is constantly assimilating terms from other languages that can't already be expressed well. In many senses, it's a global language because it is the set union of them.