I too am having fun with AO - I was originally waiting for TWT but the delayed and botched launch meant I bought AO on the basis of a handful of more recent youtube vids that said 'its got a bit better with patches'.
In fairness to TWT, AO (the game) also had a terrible not finished launch way back in January (just in Australia / NZ) to meet the tie in deadline with AO coverage in real life. A lot of the early reviews said it was unplayable and apparently v1 was pretty terrible... its since had multiple patches and was launched in the rest of the world in May in a better state (not perfect but playable). It also has some design choices (how movement / aiming and timing works) and animation (its unrealistic for a pro tennis player some say) that divides opinion - I like both but others hate it.. and these are things that can't really be patched out without a total rewrite or upsetting those that do like it as it is. So I'm going to reserve final judgement on TWT and breakpoint studio for 4 months (same time AO took to shape up)... but then I'm lucky and didn't pre-order TWT at full price like those that are so angry have... I will probably be able to pick it up fairly cheaply by then.
However, with regards to BigBen (the publisher of TWT who apparently admitted in interview that its no where near finished but they are happy it will still make a profit due to a lack of return options at retail, so they can just fix it over the coming year or in the next version), I will NEVER buy one of their game at full price unless I know its in a working, final state - seriously, we all know companies release unfinished product sometimes but to be so blatant and unapologetic, is terrible*
*with the caveat that I have only read a poorly translated version of the quote - perhaps it lost something in translation / was out of context but BigBen should be doing damage control asap if that's the case.